Q. 25.0( 1 Vote )
How much will it cost to have a triangular field weeded at the rate of Rs 2 per square metre if the length of the field’s sides are 11 m, 61 m and 60 m?
Answer :
Given:
Length of one side of the triangle (a) = 11 m
Length of second side of the triangle(b) = 61 m
Length of third side of the triangle (c) = 60 m
Semi perimeter (s) = 
According to Heron’s formula
Area of the triangle = √(s(s-a)(s-b)(s-c))
⇒ Area of the triangle = 330 sq m
Rate of weeding = Rs 2 per sq m
Total cost = (330 × 2) = Rs 660
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