Pythagoras' theorem can also be used to solve 3D problems. You often need to use Pythagoras' theorem more than once in each problem as we create extra right-angled triangles in the 3D shapes. First ...
https://doi.org/10.4169/amer.math.monthly.123.3.292 https://www.jstor.org/stable/10.4169/amer.math.monthly.123.3.292 We give an elementary proof of the Jordan Brouwer ...
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