decagon

常见例句

Take 10 golden triangles, arrange them with their sharp points touching, and you have a golden decagon, fitting perfectly within the iris of the eye, vertices neatly touching the rim.
画10个金三角，把它们的顶点挨着排好，然后你就得出一个金十边形，与瞳孔中的虹膜完美地一致，十边形的最早点正好在眼眶。
how many diagonals are there is a decagon?????
一个十角形中有多少条对角线？
regular decagon
正十边形