Spookily similar to Problem 381 ("Angle between two vectors")....
Project Euler: Problem 7, Nth prime
Permute diagonal and antidiagonal
The Answer to Life, the Universe, and Everything
Volume and area of a sphere
GJam: 2013 China Event: Cannon Angle
PACMAT 07 - Optimized Ghosts, PAC 2X Ghost Speed, 4 Lives; Interactive Download
Factorial: Unlimited Size : java.math
Identify Reachable Points
Animated GIF Creator
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