[问答题]
The circumference, C , of a given circle
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$C(A)=2 \pi \sqrt{\frac{A}{\pi}}, \quad A \geq 0$
where A is the area of the circle.
The graph of the function C , for $0 \leq A \leq 24 $, is shown below.
1. Find the value of C(24) .
2. On the grid above, draw the graph of the inverse function, $C^{-1}$ .
3. In the context of the question, explain the meaning of $C^{-1}(2 \pi)=\pi$ .
