What is the exact circumference of a circle with a radius of 15 cm?

The Answer is 94.2 the equation is C=2*3.14*r

Since pi is irrational and it is used in the formula, we cannot give an exact answer except in terms of pi (we can give an aproxamation using 3.14 = aprox pi, but it is not exact)

ok

circumfernce=2pir

r=15

circumference=2pi15

circumference=30pi

exact=30pi cm

if you want to aprox pi=3.14 then

aprox circumfernce=94.2 cm