Question

the cost of lavelling a triangular field having sides 51m, 37m, 20m at rate of ₹3 /m^2 A) ₹306 B)₹ 918 C) ₹725 D) ₹900​

Answer 1

Answer:

option b is correct = Rs 918

Step-by-step explanation:

Let a = 51m,  b = 37m,  c = 20m

s = (a + b + c)/2 = (51 + 37 + 20)/2 = 108/2 = 54 m

∴  Area of triangular ground = root under(√s(s - a)(s - b)(s - c))

= root under√54(54 - 51)(54 - 37)(54 - 20) 

= root under (√54 x 3 x 17 x 34) = 306 m2

Cost of levelling the ground = Rs 3 x 306 = Rs 918

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