Question

Calculate the sum of angles of a polygon with:​ $20$ sides

Answer 1

Given, number of sides of a polygon $\left(n\right)=20$.​

[$\because$ Sum of angles of a polygon with n sides​

$=(n-2)\times {180}^o]$​

Then, sum of angles $=(n-2)\times {180}^o$​

$=(20-2)\times {180}^o$​

$=18\times {180}^o$​

$={3240}^o$

Hence, sum of angles of a polygon with $20$ sides is ${3240}^o$.​