Lines and Angles

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint called the vertex.

Front

What is a ray?

Back

A ray is a part of a line that starts at a point and extends infinitely in one direction.

Front

What is a line?

Back

A line is a straight path that extends infinitely in both directions.

Front

What is a line segment?

Back

A line segment is a part of a line that has two endpoints.

Front

What is an acute angle?

Back

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

Front

How do you identify an acute angle?

Back

An acute angle can be identified as being smaller than a right angle.

Front

How do you identify a right angle?

Back

A right angle can be identified by its measurement of exactly 90 degrees.

Front

How do you identify an obtuse angle?

Back

An obtuse angle can be identified as being greater than 90 degrees but less than 180 degrees.