Types of AnglesA right angle has a measure of 90 degrees.

An acute angle has a measure of less than 90 degrees.

An obtuse angle has a measure greater than 90 degrees.

A straight line has a measure of 180 degrees.

.Ray

Vertex

Parts of an Angle

Other AnglesComplimentary Angles- two angles whose measurements add up to 90 degrees.

Supplementary Angles- two angles whose measurements add up to 180 degrees.

Vertical angles- Two angles, with the same measurement, that are created when two lines intersect.

DegreesAngles are measured in degrees. And can be written various ways.

A

B C

This angle can be written as < B since B is the vertex point or <ABC, a format that uses all three points in the angle for clarification.

All shapes have a degree measure. A circle measures 360 degrees.

A triangle has a measure of 180°. All the angle measures in the triangle add up to 180.

90°90°

90°90°

80°

65° 35°

Reflex Angle- an angle with a degree greater than 180.

Degrees Cont.

Adjacent angles- Angles that are next to each other. They have a common vertex and common side, but no other overlap.