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lethien23031979
2 năm trước
Cho hình thang ABCD ( AB,CD là đáy ) , biết AB bằng 9 cm, BD bằng 12 cm , DC bằng 16 cm . a) CM : Tam giác ABC đồng dạng vs tam giác BDC b) Cho góc A bằng 110 độ , góc ADB bằng 40 độ . Tính các góc còn lại của hình thanc) Tia phân giác của góc DAB cắt BD tại M . Kẻ tia phân giác của góc DBC cắt DC tại N . CM : MD.ND bằng MB.NC
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