Geometry
Drawing angles worksheets
Construct eight named angles from stated whole-degree measures. Every prompt identifies the left or right starting ray; the separate key adds the correct new ray and endpoint label.
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Measuring angles worksheets
Measure eight named angles to the nearest degree. Each diagram uses a two-sided baseline, a clearly labelled vertex and one ray above the line, with a separate numeric answer key.
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Measure each named angle to the nearest degree. Use the named baseline endpoint to choose the starting ray, and extend either ray with a ruler if needed.
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Customize this worksheetMeasure from the named starting ray
Each sheet has eight labelled angles. The three-letter angle name identifies the starting baseline side: its first letter is the endpoint of the ray that begins the measured turn, and the middle letter is the vertex.
Center the protractor on the vertex, align 0 degrees with that named ray, and measure to the upper ray to the nearest degree. Extend either printed ray with a ruler when your protractor scale sits farther from the vertex.
Learning objective
What this activity builds
Align a protractor with the named starting ray and read the scale that measures the requested turn from 1 through 179 degrees.
Worked example
Angle ABC starts from ray BA. Which protractor scale should you read?
Use the scale that begins at 0 degrees on ray BA.
The first endpoint in angle ABC identifies the starting ray from vertex B through A. The other baseline direction is present for alignment, but it is not part of the requested angle.
Teaching notes
Make the practice count
- Place the protractor center exactly on the labelled vertex.
- Align the zero line with the starting ray named in the prompt before reading a number.
- Estimate acute, right or obtuse first so the correct scale is easier to choose.
- Extend a short printed ray with a ruler when the protractor scale sits farther away.
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