Hjelmslev quadrilateral (Q7826)

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Revision as of 22:27, 30 April 2023 by Fire (talk | contribs) (‎Created claim: subclass of (P1): quadrilateral (Q7770))
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a quadrilateral with two right angles at opposite vertices
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English
Hjelmslev quadrilateral
a quadrilateral with two right angles at opposite vertices

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