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'A' squared, plus 'B' squared, must equal 'C' squared, but only if the 'C' side is the hypotenuse (long side).

A right (or left) triangle MUST have ONE 90-degree angle.

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Q: What do the side lengths of a triangle need to be to be considered a right triangle?
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How do you find an angle of a right triangle?

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How do you know if a triangle is a right triangle using the pythagorean therom?

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