find the sum of the marked angles in the figure as shown.
http://www.flickr.com/photos/81115255@N00/3259620095/
thanks.
收錄日期: 2021-04-23 15:25:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090207000051KK02197