Measuring with a Protractor

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 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 right angle?

Back

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

Front

What is a straight angle?

Back

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

Front

What is the vertex of an angle?

Back

The vertex is the common endpoint where two rays meet to form an angle.

Front

How do you measure an angle with a protractor?

Back

Place the center of the protractor on the vertex of the angle and align one ray with the zero line of the protractor.

Front

What is the range of degrees for an acute angle?

Back

0 degrees to less than 90 degrees.

Front

What is the range of degrees for an obtuse angle?

Back

More than 90 degrees to less than 180 degrees.

Front

What is the range of degrees for a right angle?

Back

Exactly 90 degrees.

Front

What is the range of degrees for a straight angle?

Back

Exactly 180 degrees.