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# Meaning of Pi

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What exactly is pi?

Guest Feb 16, 2017
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When the ancient Greeks studied circles,they always got the same number whenever they did a couple of things,and that number they called pi.

What they did : measured the area of a circle and its radius. Then divided the Area  by the square of the radius. Or,if you like  ;  A/(r^2).   They always got the same number,pi.  You will  know this as the formula for the area of a circle A = pi  X (r^2)

They also got the same number if they measured the circumference and divided it by double the radius,this gives the formula for the circumference of a circle as        circumference = 2pi X radius.

It did  not matter what size the circles they measured were,they always got the same answer,and so they realised that the relationships were constant   -,and pi is one of the most well-known constants in maths and physics. NASA has computed its value to hundreds of decimal places,as pi is a vital constant in working out problems for space travel.

Guest Feb 16, 2017