Answer:
540°
Explanation:
Given that formula to calculate sum of interior angle of a regular pentagon
s = (n-2) * 180
where n is number of side of a polygon which in this case is 5 because pentagon have 5 sides
s =(5-2) * 180
s =(3)* 180
s =540°
A pentagon has 5 sides, and can be made from three triangles, so you know what its interior angles add up to 3 × 180° = 540°
Hope it helps you.