If the size of one interior angle of a regular polygon is 108° how many sides does the polygon have?

Now, recall that the sum of all interior angles is 180(n-2), now, let's say one angle is θ, and there are "n" sides in the polygon, so if add up all the θ angles, what the sum will then be is just θn, or that product, therefore,



and surely you know how much that is.