Types of Angles and Lines

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What are parallel lines?

Back

Parallel lines are lines that never meet and are always the same distance apart.

Front

What are intersecting lines?

Back

Intersecting lines are lines that cross each other at one point.

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

How do you identify an acute angle in a picture?

Back

An acute angle looks sharp and is smaller than a right angle.

Front

How do you identify a right angle in a picture?

Back

A right angle can be identified by the square corner it forms.

Front

How do you identify an obtuse angle in a picture?

Back

An obtuse angle looks wider and is larger than a right angle.