Question

the perimeyer of an equilateral triangle is 60m.then what is the area

Answer 1

Let x be the side length of the equilateral triangle.
Perimeter is
$3x = 60 \\ x = 20 \: m$
Area is
$\frac{ \sqrt{3} }{4} {x}^{2} = \frac{ \sqrt{3} }{4} \times {20}^{2} = 100 \sqrt{3} \: {m}^{2}$