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 more than 90 degrees but less than 180 degrees?

Back

Obtuse angle.

Front

What is the measure of a straight angle?

Back

180 degrees.

Front

What are parallel lines?

Back

Lines that never intersect.

Front

What is the sum of angles in a triangle?

Back

180 degrees.

Front

What do you call two lines that intersect at a right angle?

Back

Perpendicular lines.

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

Which figure shows a set of parallel lines?

Back

Figure 4.