PUMaC 2007 · 几何（B 组） · 第 6 题
PUMaC 2007 — Geometry (Division B) — Problem 6
题目详情
- Triangle ABC has AC = 3, BC = 5, AB = 7. A circle is drawn internally tangent to the circum- circle of ABC at C , and tangent to AB . Let D be its point of tangency with AB . Find BD − DA .
解析
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Original Explanation
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