Question

What is the perimeter of a triangle measuring 3 on each side?

Answer 1

Add them all up.
A triangle has 3 sides, and you said each side is 3. So:
3+3+3 = 9

Answer 2

The perimeter of a the triangle measuring 3 on each side is 9. cause you can do 3+3+3 and it is 9 or you can do 3x3 and still get 9 either way it is 9 XD