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tiencb1001
2 năm trước
Cho hình thang ABCD có AB//DC(AB<DC) và các tia phân giác góc A và góc B cắt nhau tại K(K thuộc DC).Tia phân giác góc D cắt tia phân giác góc A tại P.Tia phân giác góc C cắt tia phân giác góc B tại Q Chứng minh rằng: a)DP vuông góc AK,CQ vuông góc BK b)AD+BC=DC c)PQ nằm trên đường trung bình hình thang ABCD
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