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Math - Geometry Lesson Plans : Perimeter & Area of Triangles


Mensuration - Solve each exercise problem related to perimeter and area of triangles given below.

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1.

The base of a triangle is twice its altitude. If the area of the triangle is 144 cm², find its base (in cm).
 
Hint      

2.

The ratio of the areas of two triangles is 2 : 3. The ratio of their heights is 3 : 2. If the ratio of their bases is 4 : y, what is y?
 
Hint      

3.

Find the area (in cm²) of a triangle with base 12 cm and height 7 cm.
 
Hint      

4.

Find the length of the hypotenuse (in cm) of an isosceles right-angled triangle having area of 484 cm².
 
Hint      

5.

Calculate the height (in cm) of a triangle whose base is 24 cm and area is 180 cm².
 
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6.

The base of an isosceles triangle is 24 cm and perimeter is 64 cm. Find its area (in cm²).
 
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7.

The base of a right-angled triangle is 5 cm and its hypotenuse is 13 cm. Find the area (in cm²) of the triangle.
 
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