E vierkant, dat is in de meetkunde e vlakke vorme worvan da d'oekn 90 groadn zyn en worvan dat de zydn even lank zyn.
't Es een specioal geval van ne regelmoatigen vieroek.
E Vierkant is 'n specioal geval van ne rechtoek èn van 'n rute. Nen kubus èt 6 vierkanten vo zyvlakkn. De diagonaln van e vierkant zyn eevn lank,snydn mekoar middndeure èn stoan lôodrechte up mekoar.
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