Posted by **sam** on Thursday, August 20, 2009 at 12:18am.

What is the relationship between the measure of a central

angle of a polygon and the measures of an interior

and an exterior angle of the polygon?

- geometry -
**MathMate**, Thursday, August 20, 2009 at 6:30am
It is important to specify that the following calculations apply to a regular polygon, of which all sides are equal in length, and all interior angles are equal.

Denote the number of sides by n.

The total of the central angles make up 360°, so each central angle is 360/n°.

The exterior angle equals also 360/n°. Note that the exterior angle is the supplement of the interior angle, namely 180° - interior angle.

The interior angle is therefore 180-exterior angle, and in terms of n, it is

interior angle = 180 - 360/n

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