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f.3 math (coordinate geometry)

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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... 顯示更多 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

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圖片參考：http://j.imagehost.org/0218/ScreenHunter_27_May_01_00_13.gif http://j.imagehost.org/0218/ScreenHunter_27_May_01_00_13.gif

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