The sides of a triangular field are 120 m, 170 m and 250 m.The cost of levelling the field at the rate of ₹7.40/m2 is:
Answer & explanation
Correct answer: option 4
We have,
Side of the triangle are = 120, 170, 250
Semi perimeter = \(\frac{(120 + 170 + 250) }{2}\) = 270
Area = \(\sqrt {s(s-a)(s-b)(s-c) }\)
= \(\sqrt {270(270-120)( 270-170)( 270-250) }\)
= \(\sqrt {270(150)( 100)( 20) }\)
= 9000 m2
The cost of leveling the field at the rate of ₹7.40/m2 is = 9000 ×7.4 = ₹66,600