Sasi Math (Revised for 1024)

Scroll:Measurement >> Area & Perimeter of Composite Figure >> ps (2904)

Written Instructions:

For each Multiple Choice Question (MCQ), four options are given. One of them is the correct answer. Make your choice (1,2,3 or 4). Write your answers in the brackets provided..

For each Short Answer Question(SAQ) and Long Answer Question(LAQ), write your answers in the blanks provided.

Leave your answers in the simplest form or correct to two decimal places.

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

36 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

28 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

22 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

30 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

40 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

18 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

16 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

24 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

38 cm

cm²

Answer:_______________

10)

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

34 cm

cm²

Answer:_______________

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

36 cm

Answer: 113 cm

Answer: 509 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 36 cm

= 72.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 72.000 cm

= 56.556 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 36 cm

= 56.556 cm

Step 4: Perimeter of shaded part → 56.556 cm + 56.556 cm + 36 cm

= 113.112 cm

≈ 113 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 36 cm x 36 cm

= 1018.008 cm²

Step 6 : Radius of semi circle → 36 cm ÷ 2

= 18 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 18 cm x 18 cm

= 509.004 cm²

Step 8: Area of shaded part → 1018.008 cm² - 509.004 cm²

= 509.004 cm²

≈ 509 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

28 cm

Answer: 88 cm

Answer: 308 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 28 cm

= 56.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 56.000 cm

= 43.988 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 28 cm

= 43.988 cm

Step 4: Perimeter of shaded part → 43.988 cm + 43.988 cm + 28 cm

= 87.976 cm

≈ 88 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 28 cm x 28 cm

= 615.832 cm²

Step 6 : Radius of semi circle → 28 cm ÷ 2

= 14 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 14 cm x 14 cm

= 307.916 cm²

Step 8: Area of shaded part → 615.832 cm² - 307.916 cm²

= 307.916 cm²

≈ 308 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

22 cm

Answer: 69 cm

Answer: 190 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 22 cm

= 44.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 44.000 cm

= 34.562 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 22 cm

= 34.562 cm

Step 4: Perimeter of shaded part → 34.562 cm + 34.562 cm + 22 cm

= 69.124 cm

≈ 69 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 22 cm x 22 cm

= 380.182 cm²

Step 6 : Radius of semi circle → 22 cm ÷ 2

= 11 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 11 cm x 11 cm

= 190.091 cm²

Step 8: Area of shaded part → 380.182 cm² - 190.091 cm²

= 190.091 cm²

≈ 190 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

30 cm

Answer: 94 cm

Answer: 353 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 30 cm

= 60.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 60.000 cm

= 47.13 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 30 cm

= 47.130 cm

Step 4: Perimeter of shaded part → 47.13 cm + 47.130 cm + 30 cm

= 94.260 cm

≈ 94 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 30 cm x 30 cm

= 706.950 cm²

Step 6 : Radius of semi circle → 30 cm ÷ 2

= 15 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 15 cm x 15 cm

= 353.475 cm²

Step 8: Area of shaded part → 706.950 cm² - 353.475 cm²

= 353.475 cm²

≈ 353 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

40 cm

Answer: 126 cm

Answer: 628 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 40 cm

= 80.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 80.000 cm

= 62.84 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 40 cm

= 62.840 cm

Step 4: Perimeter of shaded part → 62.84 cm + 62.840 cm + 40 cm

= 125.680 cm

≈ 126 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 40 cm x 40 cm

= 1256.800 cm²

Step 6 : Radius of semi circle → 40 cm ÷ 2

= 20 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 20 cm x 20 cm

= 628.400 cm²

Step 8: Area of shaded part → 1256.800 cm² - 628.400 cm²

= 628.400 cm²

≈ 628 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

18 cm

Answer: 57 cm

Answer: 127 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 18 cm

= 36.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 36.000 cm

= 28.278 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 18 cm

= 28.278 cm

Step 4: Perimeter of shaded part → 28.278 cm + 28.278 cm + 18 cm

= 56.556 cm

≈ 57 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 18 cm x 18 cm

= 254.502 cm²

Step 6 : Radius of semi circle → 18 cm ÷ 2

= 9 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 9 cm x 9 cm

= 127.251 cm²

Step 8: Area of shaded part → 254.502 cm² - 127.251 cm²

= 127.251 cm²

≈ 127 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

16 cm

Answer: 50 cm

Answer: 101 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 16 cm

= 32.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 32.000 cm

= 25.136 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 16 cm

= 25.136 cm

Step 4: Perimeter of shaded part → 25.136 cm + 25.136 cm + 16 cm

= 50.272 cm

≈ 50 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 16 cm x 16 cm

= 201.088 cm²

Step 6 : Radius of semi circle → 16 cm ÷ 2

= 8 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 8 cm x 8 cm

= 100.544 cm²

Step 8: Area of shaded part → 201.088 cm² - 100.544 cm²

= 100.544 cm²

≈ 101 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

24 cm

Answer: 75 cm

Answer: 226 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 24 cm

= 48.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 48.000 cm

= 37.704 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 24 cm

= 37.704 cm

Step 4: Perimeter of shaded part → 37.704 cm + 37.704 cm + 24 cm

= 75.408 cm

≈ 75 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 24 cm x 24 cm

= 452.448 cm²

Step 6 : Radius of semi circle → 24 cm ÷ 2

= 12 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 12 cm x 12 cm

= 226.224 cm²

Step 8: Area of shaded part → 452.448 cm² - 226.224 cm²

= 226.224 cm²

≈ 226 cm²

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

38 cm

Answer: 119 cm

Answer: 567 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 38 cm

= 76.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 76.000 cm

= 59.698 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 38 cm

= 59.698 cm

Step 4: Perimeter of shaded part → 59.698 cm + 59.698 cm + 38 cm

= 119.396 cm

≈ 119 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 38 cm x 38 cm

= 1134.262 cm²

Step 6 : Radius of semi circle → 38 cm ÷ 2

= 19 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 19 cm x 19 cm

= 567.131 cm²

Step 8: Area of shaded part → 1134.262 cm² - 567.131 cm²

= 567.131 cm²

≈ 567 cm²

10)

The figure below is formed by using a semi-circle and a quadrant.

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

π = 3.142

34 cm

Answer: 107 cm

Answer: 454 cm²

SOLUTION 1 :

Step 1: Diameter of quarter circle → 2 x 34 cm

= 68.000 cm

Step 2: Circumference of quarter circle → $\frac{1}{4}$ x π x 68.000 cm

= 53.414 cm

Step 3: Circumference of semi circle → $\frac{1}{2}$ x π x 34 cm

= 53.414 cm

Step 4: Perimeter of shaded part → 53.414 cm + 53.414 cm + 34 cm

= 106.828 cm

≈ 107 cm

Step 5: Area of quarter cicle → $\frac{1}{4}$ x π x 34 cm x 34 cm

= 908.038 cm²

Step 6 : Radius of semi circle → 34 cm ÷ 2

= 17 cm

Step 7: Area of semi circle → $\frac{1}{2}$ x π x 17 cm x 17 cm

= 454.019 cm²

Step 8: Area of shaded part → 908.038 cm² - 454.019 cm²

= 454.019 cm²

≈ 454 cm²