For any regular polygon , the sum of the exterior angles is equal to 360 degrees hence measure of any external angle is equal to 360/n. ( where n is the number of sides)

For any regular polygon , the sum of interior angles =(n-2)180 degrees

So measure of one angle in

Square-----=90

Pentagon--=108

Hexagon---=120

Heptagon--=128.5

Octagon---=135

Nonagon--=140

Decagon--=144

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