Question

Rearrange the formula C = 2πr for r.

Answer 1

r=C/2π


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year 9?

Answer 2

`(C)/(2\pi )=r`

Explanation:

`C=2\pi r`

WE need to solve for 'r'. Our aim is to get 'r' alone

2πr mean 2 times pi times r

To remove 2π we do opposite operation

Opposite operation of multiplication is division.

To remove 2π , divide both sides by 2π

`(C)/(2\pi )=(2\pi r)/(2\pi)`

Now simplify it

`(C)/(2\pi )=r`