find the circumferance of a circle that has a diameter of three inches. Give exact value

Question

find the circumference of a circle that has a diameter of three inches. give exact value

Answer 1

circumference=pi*diameter

C=(pi)(d)

  =3.14159*3

  =9.42477 in

this is not an exact value because pi is an irrational number, a non-ending, non-repeating decimal,

in other words, it cannot be written as a simple fraction a/b

Answer 2

Circumference = pi(D) = (pi)(3) = 3pi or 3π. That's the EXACT value.

Approximate value would be using 3.14 for pi
3.14
x 3
====
9.42 in.

Answer 3

What is wrong with 3π as an exact answer?  I admit it is not possible to write it as a decimal, but that was not the question.