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Is it a right triangle?
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Learn it A triangle is right-angled exactly when the two shorter sides satisfy $a^2 + b^2 = c^2$ (the converse of the Pythagorean theorem).
Example: Is a triangle with sides 20, 21, 29 a right triangle?
- $20^2 + 21^2 = 400 + 441 = 841$.
- $29^2 = 841$.
- Equal, so yes.
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