Question

Which of the following is not equivalent to the formula for the circumference of a circle, C = 2pir ?

A) C over r equals 2 times pi

B) C over pi equals 2 times r

C) C over the quantity of r times pi equals 2

D) Cr = 2pi

Answer 1

The correct answer is Cr = 2Pi

Answer 2

D) Cr = 2pi
This is because you cannot just move the r over to the other side of the question, you have to divide it out, and whatever you do to one side, you must do to the other.