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huyqwerty
2 năm trước
Tam giác ABC có AB=12cm, AC=20cm, BC= 28cm. Đường phân giác góc BAC cắt cạnh BC tại D. Qua D kẻ DE //AB ( E thuộc AC) . a) Tính đọ dài các đoạn thẳng BD, DC,DE. b) Cho biết diện tích tam giác ABC là S, tính diện tích các tam giác ABD, ADE và DCE.
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