A polygon has an interior angle sum of 2520ﾟ. How many side must the polygon have

16

Step-by-step explanation:

The sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

Here the sum is 2520, thus

180° (n - 2) = 2520 (divide both sides by 180)

n - 2 = 14 (add 2 to both sides)

n = 16

The polygon has 16 sides.