Question

If the sum of interior angles of a polygon is ${1440}^{\circ }$, then it has___ sides.

• A. 10
• B. 12
• C. 16
• D. 20

Answer 1

The correct option is A

10

Let the polygon have 'n' sides

Sum of interior angles = (n - 2) x 180°

(n -2) x 180° = 1440°

n - 2 = 8

n = 10