Question

find the cost of a lying grass in a triangular field of sides 50 m , 65 cm ,65 cm at the rate of Rs. 7 per m2​

Answer 1

SOLUTION

Since, ABC is a triangular field of sides

=) AB=50m

=)BC= 65m

=)CA= 65m

Therefore,

Semi- perimeter of triangular field

$= > s = \frac{a + b + c}{2} = \frac{50 + 65 + 65}{2} \\ \\ = > \frac{180}{2} = > s = 90m$

Area of triangular field

$= > \sqrt{s(s - a)(s - b)(s - c)} \\ = > \sqrt{90(90 - 50)(90 - 65)(90 - 65)} \\ = > \sqrt{90 \times 40 \times 25 \times 25} \\ = > 3 \times 2 \times 10 \times 25 \\ = > 1500m {}^{2}$

Cost of laying grass per 1 m^2= Rs. 7

Cost of laying grass per 1500m^2

=) (7×1500)Rs.

=) Rs.10500

HOPE it helps ✔️