Interior Angle Sum Theorem: 180° (n - 2) ; where n is the number of sides
a Pentagon has 5 sides, so n = 5
Sum = 180°(5 - 2)
= 180°(3)
= 540°
Sum divided by the number of sides equals the measure of each angle.
Each Angle = 540° ÷ 5
= 108°
Answer: 108°