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NhuQuynhnguyen0707
2 năm trước
Cho hình thang cân ABCD, có đáy lớn CD, đáy nhở AB. Qua A kẻ đường thẳng // với BC, cắt BD ở E. qua B kẻ đường thẳng // với AD, cắt AC ở F a, Chứng minh tứ giác DEFC là hình thang. b, Tính độ dài đoạn EF nếu biết AB=5cm, CD=10cm. Giúp mình nhé!! :)
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