Vocabulary
Types of Angles
Fractional Parts of a Circle
Measuring Angles

100

The direction hands move around the clock.

What is clockwise?

100

This angle measures exactly 90 degrees.

What is a right angle?

100

360/360 is equal to this many degrees.

What is 360 degrees?

100

The tool used to measure the size of an angle.

What is a protractor?

100

Adding two angles together to make a new one.

What is finding the sum of its parts?

200

The opposite direction the hands move around a clock.

What is counterclockwise?

200

This angle measures more than 0 degrees but less than 90 degrees.

What is an acute angle?

200

1/4 of a circle is equal to this many degrees.

What is 90 degrees?

200

This should always be on the zero line when using a protractor.

What is a ray?

200

Finding the missing portion on an angle.

What is finding the unknown?

300

The units of measure used to measure an angle.

What are degrees?

300

This angle measures exactly 180 degrees.

What is a straight angle?

300

The fraction that represents 270 degrees of a circle.

What is 270/360?

300

This should be directly under the "hole" or dot in your protractor when measuring angles.

What is the vertex?

300

Angle ABD equals 32 degrees and angle DBC equals 64 degrees. This is the measure of angle ABC. What type of angle is angle ABC?

What is 96 degrees? What is an obtuse angle?

400

The point where two line segments meet.

What is a vertex?

400

This angle measures more than 90 degrees but less than 180 degrees.

What is an obtuse angle?

400

The degrees equal to 1/3 of a circle. Also write this as a fraction?

What is 120 degrees? What is 120/360?

400

You should use these numbers on a protractor when your bottom ray is pointing to the left and your angle opens clockwise or to the right.

What are the outside numbers?

400

Angle QRS equals 120 degrees. Angle TRS equals 45 degrees. This is the measure of angle QRT. What type of angle is angle TRS?

What is 75 degrees? What is an acute angle?

500

A line that has an endpoint and continues without end in the other direction.

What is a ray?

500

This is formed by two rays that have the same vertex.

What is an angle?

500

The degrees equal to 1/10 of a circle.

What is 36 degrees?

500

You should use these numbers on a protractor when your bottom ray is pointing to the right and your angle opens counterclockwise or to the left.

What are the inside numbers?

500

Angle EFG measures 32 degrees. Angle EFH equals 12 degrees. This is the measure of angle HFG. What type of angle is angle EFG?

What is 20 degrees? What is an acute angle?