What is the relationship between circumference and pi?  

Expert Answers
embizze eNotes educator| Certified Educator

The circumference of a circle is found by the relation `C=pid` or `C=2pir` where d is the diameter of the circle and r is the radius of the circle.

So the circumference of a circle is directly proportional to the diameter, with the constant of proportionality `pi` .

oldnick | Student

From anicent greeks the came to know that the raztio between a cirucmference and the radius of , is costant. The problem was greek didn't known  no integer numbers yet. So another problem to find the ratio betrween a diagonal  value of a a square and its side was too much  hard.Times went by, they come to know not only the ratio between half arc of cirumference C was costant, but its value:


the points mean the number keeps on have cifres not equal zero.

tsi number is called `pi` , and wil be found in many application of math, physich and so on.