How many degrees do the internal angles of an octagon add up to?

Question

What geometric figure could be constructed from the difference in the sums of the internal angles of an octagon and a pentagon?

Answer 1

The sum of the interior angles of an octagon is 1080 degrees.

Answer 2

First, we calculate the angle of the regular octagon
90 + 45 = 135 degrees
Then, 135 x 8 = 1080 degrees