Answer :

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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