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Pi is usually used as 3.14 in math because it originally goes on to infinity. Therefore, using two significant digits (the most popular used significant digit out there), Pi is abreviated to 3.14.

The original Pi goes on forever, but is something like this:

3.147938401643257580923756348170125346938463728395647399047683

583057202350254183503827502854030284820472927492947291248...

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15y ago

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