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nguyenthimyhanh410
2 năm trước
giúp mk câu 3 mk cần gấp Cho đường tròn (O; R), đường kính AB. Trên tiếp tuyến tại A của đường tròn(O;R) lấy điểm C, kẻ cát tuyến CDE nằm giữa CA và CO, D nằm giữa C và E. Gọi H là hình chiếu của A lên CO, M là giao điểm của DB và CO. CMR 1. Chứng minh tứ giác DMAH nội tiếp 2. Chứng minh: CM.CO=CD.CE 3. Kéo dài AM cắt (O) tại F. Chứng minh E;O;F thẳng hàng. 4. Tính thể tích của hình tạo thành khi quay tam giác ACO quanh cạnh AC, biết CO= 2R
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