Question

The sum of the angles of a polygon having $20$ sides is equal to ?

• A. ${3480}^{\circ }$
• B. ${3320}^{\circ }$
• C. ${3660}^{\circ }$
• D. ${3240}^{\circ }$

Answer 1

The correct option is D ${3240}^{\circ }$

Sum of interior angles of a polygon = ${180}^o(n-2)$
When $n=20$
Sum of interior angles of a polygon $={180}^o(n-2)$ $=$ ${180}^o(20-2)={3240}^o$