Packing efficiency of 9" balloons? [more inside]
posted by nilihm on Jul 17, 2007 - 13 answers

3D Trig question: I have a 2D square in 3D space (a Face). I know the positions of the four corner vertices in form x,y,z. How do I calculate the rotation in degrees (Euler angles) as relative from the center of the face? I want to end up with degrees of rotations around x-axis,y-axis,z-axis. Bonus if you can write it in pseudocode.
posted by pooya on May 9, 2007 - 7 answers

I want a true vector-based (i.e., not merely a series of thousands of line segments) Postscript or Illustrator file of an epicycloid where a=5, b=2. [more inside]
posted by dmd on Feb 19, 2006 - 25 answers

Given the latitude and longitude of three points, how can I find the coordinates of the point that is equidistant from them? [mi] [more inside]
posted by obiwanwasabi on Feb 6, 2005 - 21 answers