How do you find how many sides a regular polygon has if you are given the measure of one of the interior angles?

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?

Ethan is proving that the slope between any two points on a straight line is the same. he has already proved that triangles 1 and 2 are similar. drag statements and reasons to complete the proof.

Multiply sixth of sixty six by a half of ten show step by step method