What is the measure of each angle of a regular hexogon?

Assertion: The measure of each angle of a regular hexagon is 120^(@) Reason: Sum of all interior angles of a polygon of n sides is (n-2) right angles.

Find the measure of each angle of a regular polygon of 20 sides?

What is the measure of an external angle in a regular octagon ?

The ratio of the measure of an angle of a regular nonagon to the measure of its exterior angle is :