http://imgur.com/a/7v8Lz
I can only think of QR=SR, so angle SQR = angle QSR = (180-48) / 2
How do I start the working out? thanks!
收錄日期: 2021-04-18 17:43:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170823161107AAsV25B