Calculate the sum of the interior angles of each polygon.

Convex & Concave Polygons

Exterior Angles of Polygons

The sum of the interior angles of an n-gon is ___________________.

A polygon with every interior angle less than 180° is convex. Any straight line through it crosses at most two sides.

A polygon with an interior angle greater than 180° is concave.

Which of the polygons above are convex? Which are concave?

What is the sum of exterior angles of a regular octagon?

Interior Angles of Polygons

An exterior angle and its adjacent interior angle are supplementary. (They add to ____ .)

The sum of the exterior angles of convex polygons is _____.

Determine the measure of each exterior angle in a regular polygon with 11 sides.

Determine the measure of

Assignment: p. 394 #1 - 8