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

c over quantity r times pi equals 2

c over quantity 2 times pi equals r

c over quantity 2 times r equals pi

2 times pi over c equals r

@Mertsj @hartnn

Question

Which of the following is not equivalent to the formula for the circumference of a circle, C = 2 pir ?

c over quantity r times pi equals 2

c over quantity 2 times pi equals r

c over quantity 2 times r equals pi

2 times pi over c equals r 

@Mertsj @hartnn

anonymous · Answer

2 times pi over c equals r

hartnn · Answer

We have C = 2 pi *r
Lets see first choice,
C/(r*pi) = 2
is this true ?

anonymous · Answer

I don't think so.. The r*pi is right, but the other parts aren't.

hartnn · Answer

C = 2 pi *r 
dividing both sides by pi*r,
what do you get ?

anonymous · Answer

I'm not sure. >.< I don't remember how to do these problems.

hartnn · Answer

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o, all first 3 choices are correct.