1. In the figure, OABC is a parallelogram. X and Y are the mid-points of AB and OC respectively.Prove that XY//AO.
圖片參考：http://img249.imageshack.us/img249/9214/35669733.png
2.The figure shows an isosceles triangle where OE=OF. M is the mid-point of EF.Prove that OM⊥EF.
圖片參考：http://img687.imageshack.us/img687/5094/82036017.png
f.3 math (coordinate geometry)
2010-05-01 8:00 am
回答 (1)
2010-05-01 8:14 am
收錄日期: 2021-04-23 20:40:14
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https://hk.answers.yahoo.com/question/index?qid=20100501000051KK00002