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'pi' was known before Pythagoras.

The Sumerian Civilisation found the constant of proportion between a circles diameter and circumference to be 3.141592.....

Later, the Classical Greeks (Pythagoras) gave this 'constant of Proportion' the name 'pi' .

'pi' in the classical Greek alphabet is the lower/small case letter 'p', for Proportion. There it has stayed ever since.

Algebrqaically

Circumference is directly proportional to diameter.

C directly proportional d

Equating

C = kd

'k' is constant of proportion and as mentioned above given the symbol 'pi'

Hence

C = pi*d

pi = C/d

or

pi = C / 2r

NB ; d = 2r

Hence the modern equ'n

C = 2pir

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lenpollock

Lvl 17
2w ago

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