Cut it in half with a compass and straightedge! Using construction tools, a video shows how to create an angle bisector. The presenter points out what it means to bisect an angle in terms of the measure and distances from the sides of the angles.

Concepts

angle bisectors, constructions, geometric constructions

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Additional Tags

math

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Instructional Ideas

• Lead a class exploration of why the particular method results in bisecting the angle
• Ask classmates if it matters how large the compass is set

Classroom Considerations

• Worksheets contain more constructions than angle bisectors

Pros

• Textbook exercises contain a problem dealing with error analysis
• Includes practice with different angle sizes
  

Cons

• None

Common Core

HSG-CO.D.12 MP5 MP6