01:12
Angles, Arcs and Sectors: Different Types of Angles
This clip introduces some of the most common angles, including the 90-degree angle (also known as the right angle), the 180-degree angle (also known as the straight angle), the acute angle and the obtuse angle.
02:49
Angles, Arcs and Sectors: Calculating Many Angles When Only One is Known
This clip explains how to use what we know about special angle relationships to find the measure of several angles when we known the measure of just one. The explanation covers vertical angles, alternate interior angles, corresponding angles, supple...