Geometry Basics

Front

Adjacent Angles

Back

Angles that share a common side.

Front

Supplementary Angles

Back

Angles that add up to 180 degrees.

Front

Complementary Angles

Back

Angles that add up to 90 degrees.

Front

Vertical Angles

Back

Angles that are on opposite sides where two lines meet. They are equal to one another.

Front

Parts of an Angle

Back

Ray, Vertex

Front

Naming an Angle

Back

The vertex must always be at the center of the angle's name.

Front

Triangle Angles

Back

Must add up to 180 degrees.

Front

Acute Angle

Back

Less than 90 degrees

Front

Right Angle

Back

90-degree angle

Front

Obtuse Angle

Back

An angle that is greater than 90 degrees.