Pi and Circles


Quick

pi - For any circle, the circumference over the diameter = 3.14 = pi = π.


Equations

c = 3.14d

1 rev = 2π rad = 360°


Nomenclature
ddiameter
ccircumference
revrevolutions
radradians
°degrees


Details

The significance of pi, π, being equal to 3.14... is that for any circle, the circumference over the diameter equals 3.14....



Therefore:

c
d
= 3.14

or:

c = 3.14d

Try it with a string and a can.