Scroll:Measurement >> Area of Triangle >> ps (1515)

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.


 

1)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 132cm.
What is the area of the triangle 




cm2


Answer:_______________




2)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 108cm.
What is the area of the triangle 




cm2


Answer:_______________




3)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 60cm.
What is the area of the triangle 




cm2


Answer:_______________




4)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 144cm.
What is the area of the triangle 




cm2


Answer:_______________




5)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 84cm.
What is the area of the triangle 




cm2


Answer:_______________




6)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 228cm.
What is the area of the triangle 




cm2


Answer:_______________




7)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 120cm.
What is the area of the triangle 




cm2


Answer:_______________




8)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 276cm.
What is the area of the triangle 




cm2


Answer:_______________




9)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 252cm.
What is the area of the triangle 




cm2


Answer:_______________




10)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 12cm.
What is the area of the triangle 




cm2


Answer:_______________




 

1)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 132cm.
What is the area of the triangle 




Answer: 726 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 132 cm

             1 unit = 132 cm ÷ 12

                      = 11 cm

Step 2: AB → 3 units = 3 x 11 cm

                                   = 33 cm

Step 3:  BC → 4 units = 4 x 11 cm

                                   = 44 cm

Step 4: Area of triangle → 12 x 33 cm x 44 cm = 726 cm2



2)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 108cm.
What is the area of the triangle 




Answer: 486 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 108 cm

             1 unit = 108 cm ÷ 12

                      = 9 cm

Step 2: AB → 3 units = 3 x 9 cm

                                   = 27 cm

Step 3:  BC → 4 units = 4 x 9 cm

                                   = 36 cm

Step 4: Area of triangle → 12 x 27 cm x 36 cm = 486 cm2



3)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 60cm.
What is the area of the triangle 




Answer: 150 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 60 cm

             1 unit = 60 cm ÷ 12

                      = 5 cm

Step 2: AB → 3 units = 3 x 5 cm

                                   = 15 cm

Step 3:  BC → 4 units = 4 x 5 cm

                                   = 20 cm

Step 4: Area of triangle → 12 x 15 cm x 20 cm = 150 cm2



4)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 144cm.
What is the area of the triangle 




Answer: 864 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 144 cm

             1 unit = 144 cm ÷ 12

                      = 12 cm

Step 2: AB → 3 units = 3 x 12 cm

                                   = 36 cm

Step 3:  BC → 4 units = 4 x 12 cm

                                   = 48 cm

Step 4: Area of triangle → 12 x 36 cm x 48 cm = 864 cm2



5)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 84cm.
What is the area of the triangle 




Answer: 294 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 84 cm

             1 unit = 84 cm ÷ 12

                      = 7 cm

Step 2: AB → 3 units = 3 x 7 cm

                                   = 21 cm

Step 3:  BC → 4 units = 4 x 7 cm

                                   = 28 cm

Step 4: Area of triangle → 12 x 21 cm x 28 cm = 294 cm2



6)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 228cm.
What is the area of the triangle 




Answer: 2166 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 228 cm

             1 unit = 228 cm ÷ 12

                      = 19 cm

Step 2: AB → 3 units = 3 x 19 cm

                                   = 57 cm

Step 3:  BC → 4 units = 4 x 19 cm

                                   = 76 cm

Step 4: Area of triangle → 12 x 57 cm x 76 cm = 2166 cm2



7)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 120cm.
What is the area of the triangle 




Answer: 600 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 120 cm

             1 unit = 120 cm ÷ 12

                      = 10 cm

Step 2: AB → 3 units = 3 x 10 cm

                                   = 30 cm

Step 3:  BC → 4 units = 4 x 10 cm

                                   = 40 cm

Step 4: Area of triangle → 12 x 30 cm x 40 cm = 600 cm2



8)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 276cm.
What is the area of the triangle 




Answer: 3174 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 276 cm

             1 unit = 276 cm ÷ 12

                      = 23 cm

Step 2: AB → 3 units = 3 x 23 cm

                                   = 69 cm

Step 3:  BC → 4 units = 4 x 23 cm

                                   = 92 cm

Step 4: Area of triangle → 12 x 69 cm x 92 cm = 3174 cm2



9)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 252cm.
What is the area of the triangle 




Answer: 2646 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 252 cm

             1 unit = 252 cm ÷ 12

                      = 21 cm

Step 2: AB → 3 units = 3 x 21 cm

                                   = 63 cm

Step 3:  BC → 4 units = 4 x 21 cm

                                   = 84 cm

Step 4: Area of triangle → 12 x 63 cm x 84 cm = 2646 cm2



10)  

In the right-angled triangle shown below, the ratio of the length of sides AB : BC : CA is 3 : 4 : 5.
The perimeter of the triangle is 12cm.
What is the area of the triangle 




Answer: 6 cm2


SOLUTION 1 :

AB : BC : CA
3 : 4 : 5

 

Step 1:  3 + 4 +5 = 12 units

            12 units = 12 cm

             1 unit = 12 cm ÷ 12

                      = 1 cm

Step 2: AB → 3 units = 3 x 1 cm

                                   = 3 cm

Step 3:  BC → 4 units = 4 x 1 cm

                                   = 4 cm

Step 4: Area of triangle → 12 x 3 cm x 4 cm = 6 cm2