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# Double Integral watch

1. The area of integration is only in first quadrant,,,

How come shouldn't it be in the top two quadrants as x = sqrt ( 1 - y^2) is a semi circle?

http://tinypic.com/r/11qs0wh/9
2. In fact the curve lies in 4th quadrant but remember that y only ranges from 0 to 1 so it can only be in the first quadrant.
3. (Original post by B_9710)
In fact the curve lies in 4th quadrant but remember that y only ranges from 0 to 1 so it can only be in the first quadrant.
Sorry I don't understand ...

http://www.wolframalpha.com/input/?i...t%7B1-y%5E2%7D

isn't that 1st and second ?
4. (Original post by SFquestion)
Sorry I don't understand ...

http://www.wolframalpha.com/input/?i...t%7B1-y%5E2%7D

isn't that 1st and second ?
It's not 100% clear, but I believe they've plotted y going horizontally.

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