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28-12-2020
Mathematics

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find area of a triangle whose two sides are 18 cm and 10cm and perimeter is 42cm step by step for class 9

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musiclover10045 musiclover10045

28-12-2020

Find the length of the 3rd side:

3rd side = 42-18-10 = 14 cm

The two shorter sides are the base and the height.

Area of triangle = 1/2 x base height

Area =1/2 x 10 x 14

Area = 70 square cm

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