Question 405814

If a {{{convex}}} polygon has {{{n}}} sides, then its {{{interior}}}{{{ angle}}}{{{ sum}}} is given by the following equation: {{{S = ( n -2) × 180}}}°.


{{{S = ( n - 2) × 180}}}......plug in your sum and solve for {{{n}}}

{{{1980= ( n -2) × 180}}}

{{{1980/ 180 =  n -2 }}}

{{{11 = n -2 }}}

{{{11+2 = n  }}}

{{{13 = n  }}}