Question

How many side has a regular polygon when each interior angle is 108°

Answer 1

Use one of them Angle Dealies... you could probably find one online ;)

Answer 2

well the exterior angle is

Exterior angle = 180 - 108

and in any polygon the sub of the exterior angles is always 360

so

number of sides( or angles) = 360/exterior angle

hope this helps

Answer 3

oops sum, not sub