Question

Find the area of a triangular field whose sides are 130 m, 140 m and 150 m. Also find the cost
of gravelling it at the rate of Rs. 2 per square metre.​

Answer 1

Answer:Rs.16800

Step-by-step explanation:

Area=√(s(s-a)(s-b)(s-c))

s=130+140+150/2

=420/2

=210

Area=√(210(210-130)(210-140)(210-150))

=√(210*80*70*60)

=8400

Cost of grayvling=2*8400

=16800