Question

find the cost of laying grass in a triangular field of sides 30m , 25m and 25m at the rate of Rs. 5 per m² (ans : 300 X 5 = Rs 1500)​

Answer 1

Answer:

Semi perimeter of the field (s) =(30+25+25)/2

= 80/2

= 40 cm

By heron's formula,

Area of the triangle = √s(s-a)(s-b)(s-c)

=√40(40-30)(40-25)(40-25)

=√40(10)(15)(15)

=√400×15×15

=300m^2

Cost of laying grass = 300×5

=₹1500