Question

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

Answer 1

c=2r because the circumference and the radius arent together its not measured together.

Answer 2

The first thing you should know in this case is that the circumference of a circle is given by:
C = 2 * pi * r
Where,
r: radius of the circle.
We have then that the following equation is not equivalent to the circumference of the circle:
Cr = 2
Answer:
The following is not equivalent to the formula for the circumference of a circle:
Cr = 2