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GeoGebraGeoGebra Lesson

Exploring Triangle Congruency Activity

Directions: For each triangle type, complete the following steps:
  1. Describe what is congruent. Identify exactly which corresponding sides and/or angles are given as congruent. Be specific.
  2. Experiment with the triangles. Move the red dots to create different triangles. Try changing the shape of the original triangle, too.
  3. Determine whether the information guarantees congruence. Can you create a triangle that is NOT congruent to the original triangle using the same given information?
  4. Record your results. Use the color of the triangle to help you:
    • Green: The triangles are congruent.
    • Orange: The triangles are not congruent.
  5. Write a conclusion. Decide whether the given information is enough to guarantee that the two triangles will always be congruent. Explain your reasoning.
Important: One successful attempt is not enough! Try several different triangle shapes before deciding. You are looking for whether the given information always guarantees congruence, not whether you can make the triangles congruent at least once.

Exploring SSS

Exploring AA (AAA)

Exploring SAS

Exploring ASA

Exploring SSA

Exploring AAS

Exploring HL (RHS)