Question

The sum of all the interior angles of a heptagon is .

Answer 1

Number of sides of a heptagon $=7$

Sum of all the interior angles of a polygon with $n$ sides
$=(n-2)\times {180}^{\circ }$

$\therefore$ Sum of all the interior angles of a heptagon
$=(7-2)\times {180}^{\circ }$
$=5\times {180}^{\circ }$
$={900}^{\circ }$