Will fan and medal!!!
The radius r of a circle can be written as a function of the area A with the following equation:
r=sqrt(A/pi)

What is the domain of this function? Explain why it makes sense in this context.

Question

Will fan and medal!!!
The radius r of a circle can be written as a function of the area A with the following equation:
r=sqrt(A/pi)

What is the domain of this function? Explain why it makes sense in this context.

anonymous · Answer

The domain of the function is $$A \ge0$$
If A is negative we get an imaginary number for the radius.  This makes sense because the area of a circle cannot be negative.