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Linear Algebra 18 Online
OpenStudy (anonymous):

HELP ! in this triangle , side AC=1, side BC=1, and side AB=2. Is triangle ABC a right triangle?

OpenStudy (mathmale):

Was there a diagram with this problem statement? If not, you might want to draw such a triangle. What rule have we that helps us to decide, mathematically, whether a given triangle is a right triangle or not?

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