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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.

Find the area (in m²) of an isosceles triangle, each of whose sides is 10 m and base 12 m.
 
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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.

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

4.

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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5.

Calculate the area (in cm² upto 1 decimal place) of an equilateral triangle of side 10 cm.
 
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6.

The area of a right-angled triangle is 30 times its base. What is its height (in cm)?
 
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7.

Calculate the height (in cm to the nearest integer) of an equilateral triangle whose area is 36.95 cm².
 
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