The sum of the interior angles of an octagon is 1080 degrees.
First, we calculate the angle of the regular octagon
90 + 45 = 135 degrees
Then, 135 x 8 = 1080 degrees
What geometric figure could be constructed from the difference in the sums of the internal angles of an octagon and a pentagon?
In the image below, what is the sum of the gray angles (in degrees)?