The sum of the measures of the angles of regular polygen is ${2160}^{\circ }$. How many sides does it have ?

Q. How many sides does a regular polygon have, if measure of each of its interior angle is ${160}^o$?

Q. How many sides does a polygon have if the sum of the measures of its internal angles is five times as large as the sum of the measures of its exterior angles?

Q. Sum of the interior angles of a regular polygon is ${1620}^{\circ }$. How many sides does this polygon have?

Q. How many sides does a regular polygon have if the measure of an exterior angle is ${24}^o$?