PUMaC 2007 · 几何（A 组） · 第 9 题
PUMaC 2007 — Geometry (Division A) — Problem 9
题目详情
- There are four spheres each of radius 1 whose centers form a triangular pyramid where each side has length 2. There is a 5th sphere which touches all four other spheres and has radius less than
解析
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Original Explanation
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