Classifying Angles and Lines

Front

What are lines that never cross and are the same distance apart?

Back

Parallel Lines

Front

What do we call an angle that is less than 90 degrees?

Back

Acute Angle

Front

What do we call lines that cross each other at a right angle?

Back

Perpendicular Lines

Front

What do we call an angle that is exactly 90 degrees?

Back

Right Angle

Front

What do we call an angle that is greater than 90 degrees but less than 180 degrees?

Back

Obtuse Angle

Front

What do we call lines that intersect at any angle other than 90 degrees?

Back

Intersecting Lines

Front

What is the term for an angle that is exactly 180 degrees?

Back

Straight Angle

Front

If two lines are perpendicular, what is the measure of the angles they form?

Back

90 degrees

Front

What is the term for angles that add up to 90 degrees?

Back

Complementary Angles

Front

What is the term for angles that add up to 180 degrees?

Back

Supplementary Angles