Classifying Angles

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Label each angle as acute, right, obtuse, straight, or reflex. (the first one is done for you)


straight angle






acute angle



obtuse angle



obtuse angle


reflex angle



right angle


straight angle


Why must an angle’s measurement always be 360° or less?

It is part of a full circle, which measures 360°.


What is the name used to classify a 90° angle?

Right angle

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Related Resources

The various resources listed below are aligned to the same standard, (4MD05) taken from the CCSM (Common Core Standards For Mathematics) as the Geometry Worksheet shown above.

Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:

  • An angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a "one-degree angle," and can be used to measure angles.
  • An angle that turns through n one-degree angles is said to have an angle measure of n degrees.


Lines and Angles


Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:

Geometric measurement: understand concepts of angle and measure angles


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