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10 October, 01:33

How to tell if a triangle is acute or obtuse from side lengths?

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  1. 10 October, 02:41
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    Let the 3 sides be a, b and c. Take the longest side c:-

    then for an acute triangle c^2 < a^2 + b^2

    and for an obtuse triangle c^2 > a^2 + b^2
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