Geometry (Lines and Angles)

Front

What are parallel lines?

Back

Lines that never meet and are always the same distance apart.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What is an acute angle?

Back

An angle that is smaller than a right angle (less than 90 degrees).

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

An angle that is greater than a right angle (more than 90 degrees) but less than a straight angle (less than 180 degrees).

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

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

What is a point in geometry?

Back

A specific location in space that has no size or dimension.

Front

How do you identify an acute angle in a picture?

Back

Look for an angle that is smaller than 90 degrees.