http://www.keiheep.edu.hk/~math/s1ch11/rotational%20symmetry/pic10.jpg
好似呢圖片咁:
有時要你畫反時針270度..
咁點畫 (冇坐標)!
收錄日期: 2021-04-12 21:24:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070413000051KK05129