Answer: 135 degrees
Step-by-step explanation:
The measure of an interior angle of any polygon is (n-2)*180/n, where n is the number of sides in the polygon.
Since the stop sign is an octagon, there are 8 sides, so we can plug in 8 for n.
Therefore, the measure of each interior angle is (8-2)*180/8
= 6*180/8
= 1080/8
= 135 degrees