Curriculum placement
Geometry. This describes the skill, not a learner estimate.
Proving triangles similar
Justify triangle similarity and proportional side relationships
Problem types
- Similarity by dilation and rigid motion
- Angle-angle similarity and correspondence
- Similar triangles: a missing side
- Corresponding angles from a similarity or congruence statement
- Similar triangles formed by crossing segments
- Prove the AA criterion with a dilation and a rigid motion
- Name the transformation property behind an AA proof step
- Find the flaw in an argument for the AA criterion
- Write a two-column similarity proof
Builds on
Leads to
Related skills
- Theorems about circles · Shared foundations
- Congruence criteria for triangles · Shared foundations
- Proofs that use coordinates · Shared foundations
- How a dilation changes a figure · Shared foundations
- Proofs about lines and angles · Shared foundations
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