Proper format of circle equation (1 Viewer)

[acallus]

When I work out the equation of a circle, I square the radius. However, In a few past papers I've completed, the answer is left as r^2 (with whatever the radius is - say 4^2 instead of 16).

Does it matter that I square it? Or should I leave it as r^2?

 

[Menomaths]

doesn't really matter, but I leave it as r^2 as the equation says

 

[obliviousninja]

doesnt really matter, if its a multi-part question, and i tend to do r^2, to avoid take r^2 as the radius, rather than r