The figure is made up of 3 semi-circles with diameter of 8 cm, 16 cm and 24 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

24 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 24 cm, 48 cm and 72 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

72 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 48 cm, 96 cm and 144 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

144 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 20 cm, 40 cm and 60 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

60 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 16 cm, 32 cm and 48 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

48 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 36 cm, 72 cm and 108 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

108 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 40 cm, 80 cm and 120 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

120 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 44 cm, 88 cm and 132 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

132 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 32 cm, 64 cm and 96 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

96 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 56 cm, 112 cm and 168 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

168 cm

cm²

cm

Answer:_______________

The figure is made up of 3 semi-circles with diameter of 8 cm, 16 cm and 24 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

24 cm

Answer: 101 cm²

Answer: 38 cm

Step 1: Radius of big semi-circle → 24 ÷ 2

                                                      = 12 cm

Step 2: Radius of medium semi-circe → 16 ÷ 2

                                                            = 8 cm

Step 3: Radius of small semi-circle → 24 ÷ 2

                                                         = 4 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 12 cm x 12 cm

                                                 = 226.224 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 8 cm x 8 cm

                                                         = 100.544 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 4 cm x 4 cm

                                            = 25.136 cm²

Step 7: Area of the shaded part → 226.224 cm² - 100.544 cm² - 25.136 cm²

                                                    = 100.544 cm²

                                                    ≈ 101 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 24 cm

                                                                 = 18.852 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 16 cm

                                                                         = 12.568 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 8 cm

                                                                     = 6.284 cm

Step 11: Perimeter of shaded part → 18.852 cm + 12.568 cm + 6.284 cm

                                                       = 37.704 cm

                                                       ≈ 38 cm

The figure is made up of 3 semi-circles with diameter of 24 cm, 48 cm and 72 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

72 cm

Answer: 905 cm²

Answer: 113 cm

Step 1: Radius of big semi-circle → 72 ÷ 2

                                                      = 36 cm

Step 2: Radius of medium semi-circe → 48 ÷ 2

                                                            = 24 cm

Step 3: Radius of small semi-circle → 72 ÷ 2

                                                         = 12 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 36 cm x 36 cm

                                                 = 2036.016 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 24 cm x 24 cm

                                                         = 904.896 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 12 cm x 12 cm

                                            = 226.224 cm²

Step 7: Area of the shaded part → 2036.016 cm² - 904.896 cm² - 226.224 cm²

                                                    = 904.896 cm²

                                                    ≈ 905 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 72 cm

                                                                 = 56.556 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 48 cm

                                                                         = 37.704 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 24 cm

                                                                     = 18.852 cm

Step 11: Perimeter of shaded part → 56.556 cm + 37.704 cm + 18.852 cm

                                                       = 113.112 cm

                                                       ≈ 113 cm

The figure is made up of 3 semi-circles with diameter of 48 cm, 96 cm and 144 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

144 cm

Answer: 3620 cm²

Answer: 226 cm

Step 1: Radius of big semi-circle → 144 ÷ 2

                                                      = 72 cm

Step 2: Radius of medium semi-circe → 96 ÷ 2

                                                            = 48 cm

Step 3: Radius of small semi-circle → 144 ÷ 2

                                                         = 24 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 72 cm x 72 cm

                                                 = 8144.064 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 48 cm x 48 cm

                                                         = 3619.584 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 24 cm x 24 cm

                                            = 904.896 cm²

Step 7: Area of the shaded part → 8144.064 cm² - 3619.584 cm² - 904.896 cm²

                                                    = 3619.584 cm²

                                                    ≈ 3620 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 144 cm

                                                                 = 113.112 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 96 cm

                                                                         = 75.408 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 48 cm

                                                                     = 37.704 cm

Step 11: Perimeter of shaded part → 113.112 cm + 75.408 cm + 37.704 cm

                                                       = 226.224 cm

                                                       ≈ 226 cm

The figure is made up of 3 semi-circles with diameter of 20 cm, 40 cm and 60 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

60 cm

Answer: 628 cm²

Answer: 94 cm

Step 1: Radius of big semi-circle → 60 ÷ 2

                                                      = 30 cm

Step 2: Radius of medium semi-circe → 40 ÷ 2

                                                            = 20 cm

Step 3: Radius of small semi-circle → 60 ÷ 2

                                                         = 10 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 30 cm x 30 cm

                                                 = 1413.900 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 20 cm x 20 cm

                                                         = 628.400 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 10 cm x 10 cm

                                            = 157.100 cm²

Step 7: Area of the shaded part → 1413.900 cm² - 628.400 cm² - 157.100 cm²

                                                    = 628.400 cm²

                                                    ≈ 628 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 60 cm

                                                                 = 47.130 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 40 cm

                                                                         = 31.420 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 20 cm

                                                                     = 15.710 cm

Step 11: Perimeter of shaded part → 47.130 cm + 31.420 cm + 15.710 cm

                                                       = 94.260 cm

                                                       ≈ 94 cm

The figure is made up of 3 semi-circles with diameter of 16 cm, 32 cm and 48 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

48 cm

Answer: 402 cm²

Answer: 75 cm

Step 1: Radius of big semi-circle → 48 ÷ 2

                                                      = 24 cm

Step 2: Radius of medium semi-circe → 32 ÷ 2

                                                            = 16 cm

Step 3: Radius of small semi-circle → 48 ÷ 2

                                                         = 8 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 24 cm x 24 cm

                                                 = 904.896 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 16 cm x 16 cm

                                                         = 402.176 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 8 cm x 8 cm

                                            = 100.544 cm²

Step 7: Area of the shaded part → 904.896 cm² - 402.176 cm² - 100.544 cm²

                                                    = 402.176 cm²

                                                    ≈ 402 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 48 cm

                                                                 = 37.704 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 32 cm

                                                                         = 25.136 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 16 cm

                                                                     = 12.568 cm

Step 11: Perimeter of shaded part → 37.704 cm + 25.136 cm + 12.568 cm

                                                       = 75.408 cm

                                                       ≈ 75 cm

The figure is made up of 3 semi-circles with diameter of 36 cm, 72 cm and 108 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

108 cm

Answer: 2036 cm²

Answer: 170 cm

Step 1: Radius of big semi-circle → 108 ÷ 2

                                                      = 54 cm

Step 2: Radius of medium semi-circe → 72 ÷ 2

                                                            = 36 cm

Step 3: Radius of small semi-circle → 108 ÷ 2

                                                         = 18 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 54 cm x 54 cm

                                                 = 4581.036 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 36 cm x 36 cm

                                                         = 2036.016 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 18 cm x 18 cm

                                            = 509.004 cm²

Step 7: Area of the shaded part → 4581.036 cm² - 2036.016 cm² - 509.004 cm²

                                                    = 2036.016 cm²

                                                    ≈ 2036 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 108 cm

                                                                 = 84.834 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 72 cm

                                                                         = 56.556 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 36 cm

                                                                     = 28.278 cm

Step 11: Perimeter of shaded part → 84.834 cm + 56.556 cm + 28.278 cm

                                                       = 169.668 cm

                                                       ≈ 170 cm

The figure is made up of 3 semi-circles with diameter of 40 cm, 80 cm and 120 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

120 cm

Answer: 2514 cm²

Answer: 189 cm

Step 1: Radius of big semi-circle → 120 ÷ 2

                                                      = 60 cm

Step 2: Radius of medium semi-circe → 80 ÷ 2

                                                            = 40 cm

Step 3: Radius of small semi-circle → 120 ÷ 2

                                                         = 20 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 60 cm x 60 cm

                                                 = 5655.600 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 40 cm x 40 cm

                                                         = 2513.600 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 20 cm x 20 cm

                                            = 628.400 cm²

Step 7: Area of the shaded part → 5655.600 cm² - 2513.600 cm² - 628.400 cm²

                                                    = 2513.600 cm²

                                                    ≈ 2514 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 120 cm

                                                                 = 94.260 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 80 cm

                                                                         = 62.840 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 40 cm

                                                                     = 31.420 cm

Step 11: Perimeter of shaded part → 94.260 cm + 62.840 cm + 31.420 cm

                                                       = 188.520 cm

                                                       ≈ 189 cm

The figure is made up of 3 semi-circles with diameter of 44 cm, 88 cm and 132 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

132 cm

Answer: 3041 cm²

Answer: 207 cm

Step 1: Radius of big semi-circle → 132 ÷ 2

                                                      = 66 cm

Step 2: Radius of medium semi-circe → 88 ÷ 2

                                                            = 44 cm

Step 3: Radius of small semi-circle → 132 ÷ 2

                                                         = 22 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 66 cm x 66 cm

                                                 = 6843.276 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 44 cm x 44 cm

                                                         = 3041.456 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 22 cm x 22 cm

                                            = 760.364 cm²

Step 7: Area of the shaded part → 6843.276 cm² - 3041.456 cm² - 760.364 cm²

                                                    = 3041.456 cm²

                                                    ≈ 3041 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 132 cm

                                                                 = 103.686 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 88 cm

                                                                         = 69.124 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 44 cm

                                                                     = 34.562 cm

Step 11: Perimeter of shaded part → 103.686 cm + 69.124 cm + 34.562 cm

                                                       = 207.372 cm

                                                       ≈ 207 cm

The figure is made up of 3 semi-circles with diameter of 32 cm, 64 cm and 96 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

96 cm

Answer: 1609 cm²

Answer: 151 cm

Step 1: Radius of big semi-circle → 96 ÷ 2

                                                      = 48 cm

Step 2: Radius of medium semi-circe → 64 ÷ 2

                                                            = 32 cm

Step 3: Radius of small semi-circle → 96 ÷ 2

                                                         = 16 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 48 cm x 48 cm

                                                 = 3619.584 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 32 cm x 32 cm

                                                         = 1608.704 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 16 cm x 16 cm

                                            = 402.176 cm²

Step 7: Area of the shaded part → 3619.584 cm² - 1608.704 cm² - 402.176 cm²

                                                    = 1608.704 cm²

                                                    ≈ 1609 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 96 cm

                                                                 = 75.408 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 64 cm

                                                                         = 50.272 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 32 cm

                                                                     = 25.136 cm

Step 11: Perimeter of shaded part → 75.408 cm + 50.272 cm + 25.136 cm

                                                       = 150.816 cm

                                                       ≈ 151 cm

The figure is made up of 3 semi-circles with diameter of 56 cm, 112 cm and 168 cm respectively.

Find the area and the perimeter of the shaded part, rounding off your answers to the nearest whole number. 

π = 3.142

168 cm

Answer: 4927 cm²

Answer: 264 cm

Step 1: Radius of big semi-circle → 168 ÷ 2

                                                      = 84 cm

Step 2: Radius of medium semi-circe → 112 ÷ 2

                                                            = 56 cm

Step 3: Radius of small semi-circle → 168 ÷ 2

                                                         = 28 cm

Step 4: Area of big semi circle → $\frac{1}{2}$ x π x 84 cm x 84 cm

                                                 = 11084.976 cm²

Step 5: Area of medium semi circle → $\frac{1}{2}$ x π x 56 cm x 56 cm

                                                         = 4926.656 cm²

Step 6: Area of small circle → $\frac{1}{2}$ x π x 28 cm x 28 cm

                                            = 1231.664 cm²

Step 7: Area of the shaded part → 11084.976 cm² - 4926.656 cm² - 1231.664 cm²

                                                    = 4926.656 cm²

                                                    ≈ 4927 cm²

Step 8: Circumference of big semi circle → $\frac{1}{2}$ x π x 168 cm

                                                                 = 131.964 cm

Step 9: Circumference of medium semi circle → $\frac{1}{2}$ x π x 112 cm

                                                                         = 87.976 cm

Step 10: Circumference of small semi circle →$\frac{1}{2}$ x π x 56 cm

                                                                     = 43.988 cm

Step 11: Perimeter of shaded part → 131.964 cm + 87.976 cm + 43.988 cm

                                                       = 263.928 cm

                                                       ≈ 264 cm