Question

. The perimeter of a square park is 120 m. Find the cost of levelling the park at the rate of 50 per meter​

Answer 1

Explanation:

Perimeter of a square park of side s=4s

=4×150=600m

So the cost of fencing at Rs.6 per meter =Rs.600×6=Rs.3600

Answer 2

Answer:

The per sq meter rate is given, and area is required to compute the cost of levelling.

Heron’s formula for Area is square root of s(s-a)(s-b)(s-c) where s stands for (a+b+c)/2, wherein a,b and c are the sides.

s = (120+170+250) / 2 = 540 / 2 = 270

Area = square root of 270 * 150 * 100 * 20

= square root of 27*15 * 2 * 100000 — [there are 5 zeros above, isolate them]

= square root of 810 * 100000

= square root of 81 * 1000000 — [making it 6 zeros, to easily take sq.root]

= 9 * 1000 square meters

At 7.4 INR / sq.m, the cost is = 9000*7.4 = 66600 Rs.

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Explanation:

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