Mathematics — first biennium · Lesson
Similar triangles have the same shape: corresponding angles are equal and corresponding sides proportional. Similarity does not imply equal size.
Prerequisites: Thales and triangles
Goal: Recognize similarity criteria and use a consistent scale factor.
In this lesson: Recognize similarity criteria and use a consistent scale factor.
How to proceed: Always identify corresponding sides; then keep the same scale ratio for every length.
You can already assume: Thales and triangles.
Completed exercises: 0/5 · Correct on first attempt: 0
Always identify corresponding sides; then keep the same scale ratio for every length.
Data / situation: Two triangles are similar by the SAS criterion. One side changes from 3 to 12.
ConceptStep separates what is required from what is recommended or useful as reinforcement. Only required prerequisites block your progress.
Relationships: solid line = required · dashed line = recommended · dotted line = reinforcement.