Angle worksheets
Practice measuring and classifying angles. You can also choose related worksheets for area, perimeter, or surface area.
Sample worksheet
Download the sample worksheet and answer key, or open the builder to change the settings.
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Before starting: Recognize the vertex and rays of an angle and use a right angle as a 90-degree benchmark.
After this: Measure angles with a protractor and compare the reading with an acute, right, or obtuse estimate.
Example questions
- Measure an angle with a protractor
- Classify 125 degrees
- Find a missing supplementary angle
Settings in the builder
- angle type
- measurement range
- diagram density
Worked example
Classify an angle measuring 125 degrees.
Answer: Obtuse
How to solve it
An obtuse angle is greater than 90 degrees and less than 180 degrees. A 125-degree angle is between those bounds.
Common mistakes
What to check
- reading the wrong protractor scale
- measuring from the end of a ray instead of the vertex
Ways to review the work
- 1
First estimate whether an angle is acute, right, or obtuse.
- 2
Have learners trace the angle opening before choosing which protractor scale begins at zero.
Teaching content updated 2026-09-05. Read our accuracy standards.