Last Updated：2025/12/05
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When arranging cannonballs in a triangular pyramid, the total number in the stack is a tetrahedral number.
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When arranging cannonballs in a triangular pyramid, the total number in the stack is a tetrahedral number.
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Related words
tetrahedral number
Noun
Japanese Meaning
数学において、1から順に得られる連続する三角数の和により構成される数。三角数を水平な三角形状に配置し、それを積み重ねると四面体（テトラヘドロン）の形になることからこの名が付く。
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