台だい形けい

noun, noun which may take the genitive case particle 'no'

trapezoid; trapezium

Geometric term for a quadrilateral with at least one pair of parallel sides. In Japanese mathematics, 台形 usually corresponds to the English 'trapezoid' (US) or 'trapezium' (UK).

• この図ず形けいは台だい形けいです。

  This shape is a trapezoid.

• 台だい形けいの面めん積せきを求もとめる公こう式しきを覚おぼえていますか。

  Do you remember the formula for finding the area of a trapezoid?