Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Learning Math Home
Session 4 Part A Part B Part C Homework
measurement Site Map
Session 4 Materials:

Measurement Session 4: Angle Measurement

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.

In This Session:

Part A:

Angle Definition

Part B:

Angles in Polygons

Part C:




Learning Objectives

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

video icon

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
regular polygon
right angle
supplementary angles

Next > Part A: Angle Definition

Learning Math Home | Measurement Home | Glossary | Map | ©

Session 4: Index | Notes | Solutions | Video


© Annenberg Foundation 2017. All rights reserved. Legal Policy