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Triangles are polygons with the least number of sides possible. However when you put many triangles together, you can build amazing things. Think about the bridge above. How many triangles do you see? Do you see any that have the same size and shape? Do you see any transformations?

Go to ACCESS - Triangles with Two Equal Sides. Complete the activity. What can you say about triangles that have two equal sides. Are they always the same shape? What else must be equal for them to be equal?

At the end of this lesson, student will be able to:

  • Identify and use rigid motions to prove two triangles are congruent

The above objectives correspond with the Alabama Course of Study: Geometry Standards: 7 and 8.

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