Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 9-inch perimeter

Question

please someone help me

Answer 1

We need to first find the Height of triangle. let the unknown Height be H.

H^2 +1.5^2 = 3^2 using pythagoras theorem.

H^2 = 3^2 - 1.5^2

=9 - 2.25

=6.75

H ~= 2.6

Area of Triangle =Height *Base ÷2

=2.6 * 3 ÷ 2

=3.9

The end.