PUMaC 2007 · 几何（B 组） · 第 10 题
PUMaC 2007 — Geometry (Division B) — Problem 10
题目详情
- A and B are on a circle of radius 20 centered at C , and ∠ ACB = 60 . D is chosen so that D is ◦ ◦ also on the circle, ∠ ACD = 160 , and ∠ DCB = 100 . Let E be the intersection of lines AC and BD . What is DE ? 2
解析
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Original Explanation
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