Types of Lines and Angles

Front

What do you call two lines that meet at a 90-degree angle?

Back

Perpendicular lines

Front

What is formed by two rays that have a common endpoint?

Back

Angle

Front

What type of angle is less than 90 degrees?

Back

Acute angle

Front

What are two lines that never meet called?

Back

Parallel lines

Front

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

Back

Obtuse angle

Front

What is the term for lines that cross each other?

Back

Intersecting lines

Front

What type of angle is exactly 90 degrees?

Back

Right angle

Front

What do you call an angle that is exactly 180 degrees?

Back

Straight angle

Front

What is the term for a line that goes on forever in both directions?

Back

Line

Front

What do you call a part of a line that has a fixed starting point and goes on forever in one direction?

Back

Ray