Congruence Teacher Resources
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If at First You're Not the Same, Try Triangles! (Part 1)
11th - 12th CCSS: Adaptable
Congruent sides + congruent angles = congruent triangles. Scholars first create several triangles that satisfy given conditions using straws. They investigate the triangles to see which are congruent, and then they define what it means...
How Do You Find a Scale Factor in Similar Figures?
5 mins 6th - 12th
Three angles of one triangle are equal to the corresponding angles in another triangle. Use a ratio of corresponding sides to find the scale factor. Actually, there are two scale factor values. The instructor will explain how to get both...
Congruence Criteria for Triangles—ASA and SSS
9th - 10th CCSS: Designed
How do you know if a pair of triangles are congruent? Use the lesson to help class members become comfortable identifying the congruence criteria. They begin with an exploration of ASA and SSS criteria through transformations and...
Similar Polygons and Scale Factors: Lesson
3 mins 7th - 11th CCSS: Adaptable
Develop an understanding of the scale of similarity. Starting with the concept of congruency, the resource introduces the idea of similarity between two figures. As part of a larger playlist on geometry, it defines similarity and uses...