decagon

常見例句

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.
畫10個(gè)金三角，把它們的頂點(diǎn)挨著排好，然后你就得出一個(gè)金十邊形，與瞳孔中的虹膜完美地一致，十邊形的最早點(diǎn)正好在眼眶。
how many diagonals are there is a decagon?????
一個(gè)十角形中有多少條對(duì)角線？
regular decagon
正十邊形