NASA engineers use pi to calculate how far the rovers on Mars have travelled, for example.

Pi is the ratio of a circle's circumference to its diameter. That number is rounded to 3.14, which is why Pi Day is celebrated on March 14.

Hungry for Pi? Check out NASA's Pi Day challenge and put your wits to the test solving problems just like NASA scientists and engineers.

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Pi is the ratio of a circle's circumference to its diameter. That number is rounded to 3.14, which is why Pi Day is celebrated on March 14.

Pi is the ratio of a circle's circumference to its diameter. That number is rounded to 3.14, which is why Pi Day is celebrated on March 14.