Question

Find the area of an equilateral triangle (regular 3-gon) with the given measurement.

9-inch perimeter

A = sq. in.

Answer 1

Im confused is

Answer 2

A = 1/2aP
Note, there is also a formula for finding the area another way which is what I will use. That is A = 1/4(√3)(s^2)
A = 1/4(√3)(9)
A = 2.25√3 or 9/4(√3)