等とう脚きゃく台だい形けい

noun

isosceles trapezoid; isosceles trapezium

A trapezoid with congruent base angles and equal-length legs. Used in geometry.

• 等とう脚きゃく台だい形けいの底てい角かくは等ひとしい。

  The base angles of an isosceles trapezoid are equal.

• この図ず形けいは等とう脚きゃく台だい形けいです。

  This shape is an isosceles trapezoid.