Types of Angles and Lines

Front

Vertical Angles

Back

Angles opposite each other when two lines cross. They are always equal.

Front

Supplementary Angles

Back

Two angles whose measures add up to 180 degrees.

Front

Complementary Angles

Back

Two angles whose measures add up to 90 degrees.

Front

Right Angle

Back

An angle that measures exactly 90 degrees.

Front

Obtuse Angle

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

Acute Angle

Back

An angle that measures less than 90 degrees.

Front

Alternate Interior Angle

Back

Angles that are on opposite sides of the transversal and inside the two lines.

Front

Alternate Exterior Angle

Back

Angles that are on opposite sides of the transversal and outside the two lines.

Front

Consecutive Interior Angle

Back

Angles that are on the same side of the transversal and inside the two lines. They are supplementary.

Front

Consecutive Exterior Angle

Back

Angles that are on the same side of the transversal and outside the two lines.