Answers

2015-06-26T20:15:47+05:30
Length of sides = 51, 37  and 20 

s =  \frac{51+37+20}{2} = \frac{108}{2} =54

Area =  \sqrt{s(s-a)(s-b)(s-c)} \\ \\A= \sqrt{54(54-51)(54-37)(54-20)} \\ \\A= \sqrt{54 \times 3 \times 17 \times 34} \\ \\A = 306\ m^2

Rate = Rs. 3 per m²
Cost  = 3×306 = Rs. 918
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