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# Rectangle

There is a point O in ABCD rectangle such that $$OA^2+OC^2=OB^2+OD^2$$.

Note by Demon Devil
3 years, 7 months ago

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This is actually true for all points $$O$$ inside rectangle $$ABCD$$ and not just for one point.

This result is known as the British Flag Theorem. · 3 years, 7 months ago