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Math Forum: Ask Dr. Math FAQ: About Pi
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Ask Dr. Math: FAQ
A bout Pi
Dr. Math FAQ
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8d1
What is pi ( )? Who first used pi? How do you
find its value? What is it for? How many digits is it?
By definition, pi is the ratio of the circumference of a circle to its
diameter. Pi is always the same number, no matter which circle you use to compute it.
For the sake of usefulness people often need to approximate pi. For many purposes you can use 3.14159, which is really pretty good, but if you want a better approximation you can use a computer to get it. Here's pi to many more digits: 3.14159265358979323846.
The area of a circle is pi times th"
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