Question

What's the circumference of a circle with a diameter of 12ft

Answer 1

circumfernce=2pir
or
c=pid

d=12
c=12pi ft

fun fact: pi represents the ratio between the circmferece and diameter,
basically, pi=circumference/diameter so then pid=c


circumference=12pi ft

Answer 2

The circumference is:
37.699111843078 ft