Question

If it's perimeter of an equilateral triangle is 180cm, what will be it's area?

Answer 1

perimeter=3*length of one side
=3*x=180
=x=60
area is root3/4*length^2
put the values

Answer 2

Perimeter = 180

Side of triangle = 180/3

= 60 cm

$area = \frac{ \sqrt{3} }{4} \times {a}^{2}$
$area = \frac{ \sqrt{3} }{4} \times 3600 \\ = 900 \sqrt{3}$