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

Note by Demon Devil
4 years, 1 month 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.

Jimmy Kariznov - 4 years, 1 month ago

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