PUMaC 2025 · 团队赛 · 第 11 题

PUMaC 2025 — Team Round — Problem 11

Let A be a quadrilateral on a sphere, whose sides are all sections of great circles. All the sides ◦ of A are congruent, and all the corners of A are 120 . Find the proportion of the sphere’s surface area enclosed by the quadrilateral.

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