HELP!!

the area A of the circle in the figure
can be represented by A(r)=pi,r^2 where r is the radius
what are the resonable domain and range for each function? explain

the problme before this made me make a equation of B(r)=5^2-pi,r^2 im not sure if there asking this or A(r)=pi,r^2 please answer both just in case tho

the figure is a circle in a 5x5 square the circle shows radius as r

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