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Grade 4 Math · World 9: Angle and Shape Studio · Level 90
Make an Angle
Turn a ray to make an angle of a given size or type.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 90
- You can make an angle too. The black ray stays still. Turn the red ray to open or close the angle.
- To make a 120° angle, count up from 0 on the black ray's side: 10, 20, 30… all the way to 120. It's past 90, so it's obtuse.
Georgia's K-12 Mathematics Standards:
- 4.GSR.7.1 — Recognize angles as geometric shapes formed when two rays share a common endpoint. Draw right, acute, and obtuse angles based on the relationship of the angle measure to 90 degrees.