It’s irrational Captain

3.14159

Of course it Pi – today is Pi day (March 14 @1.59 – get it?) – it’s also Einstein’s birthday.

An irrational number is one that can’t be expressed as a fraction (when expressed as a decimal it goes on for ever not recurring).  Pi is often expressed as 22/7 but this is an approximation and not exact.

OK – my favourite Pi fact ..

If you were to wrap a piece of (non stretchable) string around the world tightly then raise it by 1 inch away from the earth all round, how much longer would the ‘1 inch off’ piece of string be (compared to the ‘tight’ string)?

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