# Find the coordinates of a point on a circle given 2 points and an angle

I have a circle with A as a center, B and C 2 points on the circle. I have the coordinates of A (the center) and B (the point on the circle). How can I find the coordinates of C (another point on the circle knowing that the angle BAC is 0.384 rad (or 22 degrees). The Y axe is upside down (see picture http://i.stack.imgur.com/4Vp4W.jpg)

So I have (Xa, Ya) and (Xb, Yb) and I need to find (Xc, Yc) respecting the given axis.

Thanks

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