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MathMentor

Learn with Mentor · 8 min

Pythagoras' Theorem: Find a Missing Side

Use a² + b² = c² to find either the hypotenuse from two legs or a missing leg from the hypotenuse and one leg.

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What are we learning?

Pythagoras' theorem works only in right-angled triangles. It connects the two shorter sides, called legs, with the longest side, called the hypotenuse: a² + b² = c².