three sides (length, width, height)
Used when referring to the three dimensions of an object, especially in contexts like shipping, packaging, or geometry.
この箱の三辺の合計は120センチ以内です。
The sum of the three sides of this box is within 120 cm.
trilateration
A compound of 三 and 辺. The reading さんぺん reflects consonant assimilation at the boundary between the two Sino-Japanese elements.