Question

find the cost of laying grass in a triangular field of sides 50,65 and 65 metre at the rate of rupees 7 per metre square​

Answer 1

Answer:

Sides of the triangle are a=50m,b=65m,c=65m

Area of triangle, by Heron's formula =s(s−a)(s−b)(s−c)

where, 

s=2a+b+c

s=250+65+65

s=90

Area of triangle = 90(40)(25)(25)

Area of triangle = 1500m2

Cost of laying grass = Area ×7

Cost of laying grass =1500×7

Cost of laying grass = Rs 10500

Answer 2

Answer:

putting heron's formula of isosceles triangle b/4(4a^2-b^2)^1/2 =50/4(4×65^2-50^2)^1/2 =1500m^2 ;cost per meter ^2=7 rupees;so 1500×7=10500 rupees