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Puzzles involving various geometric shapes, in a flat plane and in three-dimensional space.
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There exist 4 points in 3D space A, B, C and D such that:
AB = 7.2, AC = 9.6, AD = 15.6, BC = 12, BD = 15.6, CD = 15.6
Calculate the radius of the sphere which circumscribes these four points.
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