trilateral

In geometry class, we learned that a trilateral is simply a three-sided polygon.

用法提示：trilateral 作名词，指“三边形”。

The student drew a trilateral on the board and labeled each of its three sides.

用法提示：trilateral 是名词，在这里指“三边形”。

A trilateral has three angles as well as three sides.

用法提示：trilateral 作为名词，表示“三边形”。