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Cube vs Octahedron sphere covering (Posted on 2025-02-28) Difficulty: 3 of 5
A small sphere is centered at a corner of a large cube. What proportion of the surface of the sphere is inside of the cube?

Answer the same question with the cube replaced with a regular octahedron.

No Solution Yet Submitted by Jer    
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re: Possible answer Comment 3 of 3 |
(In reply to Possible answer by Larry)

You can easily fit 6 octahedra with room to spare, so the answer must be less than 1/6.

https://www.desmos.com/3d/r4k3i1tjkn

If you think about it, an octahedron is "pointier" than a cube, so the answer is probably less than 1/8.
(incidentally, I agree with Charlie's answer, but my method is simpler.)

  Posted by Jer on 2025-02-28 13:30:16
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