In this session, we will investigate angle measurement. We will review appropriate notation and describe angles in terms of the amount of turn. Looking at angles in this way highlights the fact that angle measure is dynamic rather than static -- it changes as the amount of turn changes.

For information on required and/or optional materials for this session, see Note 1.

Part A:	Angle Definition
Part B:	Angles in Polygons
Part C:	Geo-Logo
Homework

In this session, you will do the following:

Use the fact that there are 360 degrees in a complete turn to find the measures of angles in polygons

Learn about the relationships between the angles within shapes

Generalize a formula for finding the sum of the angles in any n-gon

Use software to explore the differences between interior, exterior, and central angles

Understand the relationships between turns, resulting angles, and the number of sides of a regular polygon

Throughout the session you will be prompted to view short video segments. In addition to these excerpts, you may choose to watch the full-length video of this session.

New in This Session:

acute angle
adjacent angles
central angle
complementary angles
congruent angles
exterior angle

interior (vertex) angle
irregular polygon
obtuse angle
polygon
regular polygon
right angle
supplementary angles

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