Sigaran kupat (Indonésia: ''Belah ketupat'' Inggris: ''rhombus'') iku wangun raèn rong dhimènsi kang iwangun déning patang rusuk kang dawané padha, lan nduwèni rong pasang pojok dudu siku-siku kang sabenpojoké padha gedhéné karo pojok ing sangarepé.
Sigaran kupat bisa diwangun saka rong segitelu sama kaki idhèentik kang simètri ing dhasaré.
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