Hypotenuse Leg (HL) Congruence Theorem
This lesson will introduce a very long phrase abbreviated CPCTC. It's easy to remember because every other letter is "C," you see? The Hypotenuse Leg or HL Theorem, is not as funny as the Hypotenuse Angle or HA Theorem, but it is useful. This theorem is really a derivation of the Side Angle Side Postulate, just as the HA Theorem is a derivation of the Angle Side Angle Postulate.

Video Summary
After working your way through this lesson, you are now able to recall and state the Hypotenuse Leg (HL) Theorem of congruent right triangles, use the HL Theorem to prove congruence in right triangles, and recall what CPCTC means (corresponding parts of congruent triangles are congruent), using as needed.

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