Page 111 - Mathematics_Std_4

3. Find the area of a triangular road sign if its base is 40
centimetres and its height is 55 centimetres.

4. A triangle has a height of 96 cm and a base of 24 cm. Find
its area.
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5. Find the area of a triangular garden with a height of 9 m
and a base of 6 m.
6. The base of a triangle is 40 centimetres. If its height is 30

centimetres find the area of the triangle.

7. A triangle has a height of 15 metres. If its base is 26 metres.
Find the area of the triangle.
8. An engineer wants to construct a building with a triangular

roof of the height 27 metres and the base of 36 metres.
Find the surface area of the roof.

Activity 3 Using reliable online resources to learn about
the area of rectangles, squares, and triangles

Description

Use online resources and programs such as GeoGebra and
Khan Academy to learn more about the area of rectangles,
squares, and triangles.

Summary

1. The formula for finding the area of a triangle;
Area of a rectangle = length × width.
2. The formula for finding the area of a square;

Area of a square = length × length.
3. The formula for finding the area of a triangle;

Area of a tri =angle 1 × × base height.
2

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