Question

find the area of an equilateral triangle whose perimeter is 180 cm​

Answer 1

Answer: 900√3 cm²

Step-by-step explanation:

Perimeter = 3a

a =180/3

a=60cm

area of equilateral triangle = $\sqrt{3} /4 * a^{2}$

$\sqrt{3} /4 * 60^{2}$

= 900√3 cm²

Answer 2

Answer:

a+b+c= 180 In equilateral all sides are equal so, a+a+a= 180 3a= 180 a= 180÷3 a= 60. a=60 ,b=60 ,c=60