1. What reqiurements does a quadrangle need that all the perpendicular bisectors of the sides crosses in one point??(adsbygoogle = window.adsbygoogle || []).push({});

2. And how can you proof it?

To 1. - I think each angle have to be 90° but I can't proof it

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# Homework Help: Perpendicular bisectors of the sides in a quadrangle

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