Think you know pi? Take NASA's quiz on the eve of everyone's favorite number day

March 13, 2015 8:11 PM

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People who love numbers have been looking forward for weeks to Saturday, March 14, 2015. Written as numbers, that's 3/14/15 which corresponds to the first five digits of the mathematical constant pi (3.1415). The numbers line up only once a century, and it's a great day to think about this incredibly useful number. NASA even has a Pi Day Challenge to see how much you know pi.

Pi is the ratio of the circumference to the diameter of a circle. If you know the distance across a circle, you can find out how far it is around by using the pi formula. Needless to say, NASA's scientists are all about pi. They use the formula to calculate the volume and surface of planets just for...

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