AoPS Academy
The Piphi Wiki project is administered by the legendary piphi for supporting educational content useful to avid math students.
Projects
Miscellaneous
Three mutually tangent spheres of radius 
rest on a horizontal plane. A sphere of radius 
rests on them. What is the distance from the plane to the top of the larger sphere?
It is Monday November 25, 2024, 07:19 (GMT).
There have been 237,247 edits to 10,612 articles since January, 2006.
3,356 files have been uploaded. There are 250,446 users registered.
Something appears to not have loaded correctly.
