Question

A billiards triangle is equilateral. What is its perimeter? (Note: The illustration is of an equiangular triangle drawn from one side.)



5 1/8 in.
10 1/4 in.
33 3/4 in.
11 1/4 in.

Answer 1

Set the two side lengths equal, and solve for x.

Then plug x back into one of the sides, giving you the length of the side.

Multiply it by 3, since it's an equilateral triangle.

Answer 2

but how do you do that?