This fourth-grade geometry lesson teaches the definitions for a line, ray, angle, acute angle, right angle, and obtuse angle. We also study how the size of the angle is ONLY determined by how much it has "opened" as compared to the whole circle. The lesson contains many varied exercises for students.

Concepts

angles

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Additional Tags

homeschoolmath: lines, rays, and angles, acute angle, line segment, obtuse angle, right angle

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Classroom Considerations

• Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
• The intended use for this resource is Instructional

Common Core

4.MD.C.6 4.MD.C.7 4.MD.C.5.a 4.MD.C.5.b 4.G.A.1