Transform proofs using triangle rotations. By rotating a triangle around various points, class members develop proofs. Participants prove relationships of alternative interior angles formed by parallel lines and the sum of the interior angles of a pentagon.

Concepts

parallel lines with a transversal, alternate interior angles, congruence, congruent angles, transformations, angle of rotation, rotations, interior angles, pentagons

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Additional Tags

math

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Instructional Ideas

• Create groups to share the sequences used to answer the questions
• Demonstrate how to use each of the tools prior to the activity

Classroom Considerations

• The class should be familiar with rotations as transformations

Pros

• Provides initial directions on how to use the tools
• Contains sliders for multiple rotations

Cons

• None

Common Core

8.G.A.5 HSG-CO.C.9 HSG-CO.C.10 MP5