Geometry Basics

Front

Line

Back

Set of all points between 2 points that extend forever.

Front

Ray

Back

A line that ends in one direction.

Front

Segment

Back

A line that ends in both directions.

Front

Angle

Back

Formed by 2 rays that meet at a common point called a vertex.

Front

Obtuse Angle

Back

An angle between 90 degrees and 180 degrees.

Front

Acute Angle

Back

An angle between 0 degrees and 90 degrees.

Front

Complementary Angles

Back

Two or more angles that add up to 90 degrees.

Front

Supplementary Angles

Back

Two or more angles that add up to 180 degrees.

Front

Adjacent Angles

Back

Two angles with a common side and vertex.

Front

Congruent Angles

Back

Two angles that are the same.