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9-12.

For each figure below, determine if the two smaller triangles in each diagram are congruent. If so, write an appropriate triangle congruence statement (you do not have to make a flowchart). Then solve for . If the triangles are not congruent, explain why not.

Each set of triangles is congruent. Now show why or how.

  1. Congruent because of , .

  1. Congruent because of , .