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OpenStudy (anonymous):
Classify each triangle as acute, right, or obtuse. the lengths are 4,5,7
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OpenStudy (harsimran_hs4):
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OpenStudy (harsimran_hs4):
cos of an obtuse angle is negative cos A = (b^2 + c^2 - a^2)/2(bc) ||ly for cos B = (a^2 + c^2 - b^2)/2ac etc can you proceed now?
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