Geometry
Naming angles worksheets
Identify vertices and directed rays, give four valid names for a single angle, and name every angle formed by three or four rays. Twelve questions include complete answer lists.
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Classifying angles worksheets
Classify 20 angles as acute, right, obtuse or straight. Ten questions use unlabelled diagrams and ten use exact degree measures, followed by a separate answer key.
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Classify each angle as acute, right, obtuse or straight. Use the picture in the first section and the stated degree measure in the second section.
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Angles keep the same measure when a diagram is rotated. A right-angle square is an exact fact; otherwise use the stated degree measures when they are supplied. The first ten questions on the classification sheet intentionally omit measures so learners reason from the picture.
Naming practice uses directed rays. Read ray BA from vertex B through A. In a multi-ray figure, every pair of rays determines an angle, including a larger angle that spans smaller sectors.
Learning objective
What this activity builds
Connect the size of a turn with the four angle classes and use 90 and 180 degrees as exact boundaries.
Worked example
How should a 91-degree angle be classified?
Obtuse.
A right angle is exactly 90 degrees. Because 91 is greater than 90 but less than 180, the angle is obtuse. A straight angle must measure exactly 180 degrees.
Teaching notes
Make the practice count
- Establish the exact boundaries first: less than 90, equal to 90, between 90 and 180, and equal to 180.
- Rotate a right-angle corner to show that orientation does not change the angle class.
- Ask for an estimate before measuring a drawn example.
- Compare near-boundary measures such as 89, 90 and 91 degrees aloud.
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