Question

The sum of interior angles of a polygon with 12 sides is___

• A. Closed curve
• B. Point
• C. On the boundary
• D. Line

Answer 1

The correct option is C On the boundary

Sum of interior angles of a polygon with n sides $=(2n-4)\times {90}^{\circ }$

$\therefore$ Sum of interior angles of a polygon with 12 sides $=(24-4)\times {90}^{\circ }$

$=20\left({90}^{\circ }\right)$

=1800°