vertex

n. 顶点,最高点,头顶

Situated at the vertex or highest point; directly overhead.

顶点的在顶点或者最高点的；头的正上方的

The perpendicular distance from the base of a geometric figure to the opposite vertex, parallel side, or parallel surface.

顶垂线，高线从一个几何形体的底边到相对的顶点、平行边或平行面的垂直距离