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Angles

Author: Kyle Webb

Review of Congruent Segments

Take a look back at what congruent segments are.

Rays

What is a ray?

Angles

What is an angle?

Congruent Angles

Just like line segments, angles can be congruent.

Two angles are congruent when they have the same measure.

Example:

 

We can show that two angles are congruent by using a little "tick" like we do with congruent line segments.

To see an example, look at angles angle B A C and angles angle C D E

Angle Bisectors

If a ray divides a larger angle into two smaller, congruent angles, it is called an angle bisector.

Angle Relationships

When two lines intersect, they form some angles. These are some of the relationships between those angles.

Complementary & Supplementary Angles

Two angles that sum up to 90 degree are called complementary angles.

(Angles x and y are complementary angles)

Two angles that sum up to 180 degree are called supplementary angles.

(Angles a and b are supplementary angles)