https://www.flickr.com/photos/124898006@N08/32614562804/in/dateposted-public/
In addition, according to the model answer, if M is the mid-point of AB, the triangle VMD is a right-angled triangle, do you agree, please prove.
Thank you very much
Please answer the following question.?
2017-03-16 12:21 am
回答 (1)
2017-03-18 7:59 am
✔ 最佳答案
angle ABC=90 & angel VBC=90 --> plane VAB is perpendicular to plane ABCD, then you can solve the question.
收錄日期: 2021-04-23 23:48:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170315162144AAFBftt