14. Find the cost of laying grass in a triangular fieldof sides 50 m,

1.	14. Find the cost of laying grass in a triangular fieldof sides 50 m, 65 m and 65 m at the rate ofper m2(A) 9500(C) 10500(B)(D)1100012500
Answer» using heron's formula. s = (50+65+65)/2 = 180/2 =90the area of triangle = √s(s-a)(s-b)(s-c) = √90(40)(25)(25) = 1500 m² so total cost will be = cost/m² × area = 7×1500= 10500rs

14. Find the cost of laying grass in a triangular fieldof sides 50 m, 65 m and 65 m at the rate ofper m2(A) 9500(C) 10500(B)(D)1100012500

Answer»

using heron's formula. s = (50+65+65)/2 = 180/2 =90the area of triangle = √s(s-a)(s-b)(s-c) = √90*(40)(25)*(25) = 1500 m²

so total cost will be = cost/m² × area = 7×1500= 10500rs