Lines and Angles

Front

What is a right angle?

Back

An angle that forms a square corner and has a measure of 90 degrees.

Front

What type of angle is less than 90 degrees?

Back

Acute angle.

Front

What type of angle is exactly 90 degrees?

Back

Right angle.

Front

What type of angle is greater than 90 degrees but less than 180 degrees?

Back

Obtuse angle.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What are parallel lines?

Back

Lines that never intersect 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 the sum of angles in a triangle?

Back

180 degrees.

Front

What is the definition of a line segment?

Back

A part of a line that has two endpoints.

Front

What is the definition of a ray?

Back

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