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nguyenthanhcong.2002vta
2 năm trước
Cho đường tròn (O ; R) đường kính MN. Vẽ dây cung AB=R, MA và NB kéo dài cắt nhau tại E a) tính số đo cung AB nhỏ và góc MEN b) gọi H là giao điểm của MB và NA. Chứng minh tứ giác EAHB nội tiếp c) Chứng minh MH×MB+NH×NA=4R^2
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