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Grade 4 Math · World 9: Angle and Shape Studio · Level 89
Measure with a Protractor
Read angle measures in degrees.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 89
- A protractor measures angles. Put its center on the vertex, and line up the bottom with one ray.
- Start at 0 on the side of that ray, and count up to the other ray. This angle is 60°.
- Estimate first! 90° points straight up. This angle is past 90, so it's obtuse: 130°.
Georgia's K-12 Mathematics Standards:
- 4.GSR.7.2 — Measure angles in reference to a circle with the center at the common endpoint of two rays. Determine an angle’s measure in relation to the 360 degrees in a circle through division or as a missing factor problem.