tetriamond
(mineralogy) A triclinic mineral containing aluminum, calcium, iron, magnesium, oxygen, and silicon.
plural of psoas
(geometry) A polyiamond made up of four triangles.
plural of greenstick fracture
ワークショップでは、学生たちは合同な正三角形4枚で構成されるポリアイアンドの組み立て方を学んだ。
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