noun🔗Share四面体A polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids."The student built a model of a tetrahedron for her geometry project, using four equilateral triangles to form its faces. "生徒は、その幾何学プロジェクトのために、4つの正三角形を使って面を形成し、四面体の模型を作りました。mathstructureChat with AIVocabulary GamePractice Reading
