Find the area of equilateral triangle (regular 3 gon) with 9 in perimeter

Area = 3.897

Step-by-step explanation:

Remark

What you are subtly being told is the side of an equalateral triangle = P/n.

n = the number of sides

n = 3

P = 9

side = 9/3 = 3

The area of an equalateral triangle given 1 side is

Area = sqr (3) * s^2 / 4

Area = 3.897