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B2.Cho góc nhọn xoy.trên ox lấy a và trên oy lấy b sao cho oa=ob.kẻ đường thẳng vuông góc với ox tại a cắt oy tại d.kẻ đường thẳng vuông góc với oy tại b cắt ox tại c.Giao của ad và bc tại e.nối oe,cd a) chứng minh ∆abd=∆add và bd=de b)chứng minh ∆ecd cân c)tia oe cắt cd tại h.chứng minh oh vuông góc cd d)cho oe =13cm,oa=12cm,tính eb
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