sphere

Right Double Cone

Posted on June 26, 2019 by Samuel Nunoo

Take a solid cylinder of radius R and height 2R. Remove the right “double cone” which passes through the center...

Posted on June 26, 2019 by Samuel Nunoo

The intersection of two spheres is generally a circle (but might also be a point or the empty set). That...

Posted on June 5, 2019 by Ashley Tung

Here’s a challenging problem with a surprisingly easy answer: can you show that for any 5 points placed on a sphere,...