All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Shapes
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    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
re(3): Possible answer | Comment 5 of 6 |
(In reply to re(2): Possible answer by Larry)

Since there are 4*pi steradians in a sphere and there are 1/9.24441273502668 sphere equivalents at each of the vertices of the octahedron, there are a total of 6*pi/9.24441273502668 steradians total in the octahedron.


The octahedron has fewer vertices than the cube and each vertex has fewer steradians, so assumption 1 was wrong.

  Posted by Charlie on 2025-03-02 11:22:04
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (9)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2025 by Animus Pactum Consulting. All rights reserved. Privacy Information