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Congruent figures

This site defines congruent figures and shows examples.

Congruent figures

This site shows different ways to prove that triangles are congruent.

4.1  Congruent Triangles

4.2  Proving Triangles Congruent

Proving Triangles Congruent 

This site lists the triangle congruence postulates and theorems.

4.3  Using Congruent Triangles

4.4  Isosceles and Right Triangle Theorems

Right Triangle Theorems

This site lists the right triangle theorems.

4.5  Altitudes, Medians, and Bisectors

Altitudes and Centers

This site defines altitudes and lists the proofs of the concurrency of the altitudes.