Q3 of 31 Page 45

If the length of the sides of a triangular plot of land are 20 m, 21 m and 13 m, what is its area?

Given:


Length of one side of the triangle (a) = 20 m


Length of second side of the triangle(b) = 21 m


Length of third side of the triangle (c) = 13 m


Semi perimeter (s) =


According to Heron’s formula


Area of the triangle = √(s(s-a)(s-b)(s-c))


⇒ Area of the triangle = 126 sq m


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1

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 4

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