Math Problem Statement
Cho (O;R), điểm A nằm ngoài (O). Vẽ hai tiếp tuyến AB, AC (B, C là hai tiếp điểm) và cát tuyến AMN (AM<AN). Vẽ dây BD của (O) và BD//MN. Gọi I là trung điểm của MN. Chứng minh rằng C, I, D thẳng hàng.
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Circles
Tangents
Secants
Formulas
Power of a point: AM * AN = AB^2
Properties of parallel lines and transversals
Theorems
Tangent-Secant Theorem
Midpoint Theorem
Similarity of Triangles
Suitable Grade Level
Grades 10-12
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