Question

find the area of an Equalateral triangle (regular 3-gon) with the given measurement 9 inch perimeter? A= sq. in.​

Answer 1

Explanation:

P= 3a ( a is the side of triangle)

a=P/3 =3

A=√3/4 a^2

= √3/4 * 9 = 3.9 sq. inch