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maximum possible area of the circle

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by cbenk121 » Sun Dec 20, 2009 9:27 pm
nailyad wrote:In the area XY plane each point on the circle K has nonnegative coordinates and the center of the K is point (4;7).What is the maximum possible area of K?

Answers:

4
9
16
28
49

N
OK, so understanding prob correctly, each point must have positive X & Y coordinates.

Since the center of the circle is at (4,7), then the maximum radius is 4 (otherwise, part of the circle would spill over into negative territory (i.e cross Y axis). Therefore, answer is 16pi.
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