Lines and Angles

Front

What are perpendicular lines?

Back

Two lines that intersect at 90º.

Front

What are parallel lines?

Back

Two lines that will always stay the same distance apart without intersecting.

Front

What is an angle?

Back

The space between two intersecting lines measured in degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What do we call two lines that meet at a point?

Back

Intersecting lines.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is a ray?

Back

A part of a line that has one endpoint and extends infinitely in one direction.

Front

How can you identify perpendicular lines?

Back

They form right angles (90º) when they intersect.