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How can I calculate center of a circle $x,y$? I have 2 points on the circumference of the circle and the angle between them.

The 2 points on the circle are $P_1(x_1,y_1)$ and $P_2(x_2,y_2)$. The angle between them is $\theta$. I know all these values; how can I calculate the center from these values?

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    what do you mean by the angle between the points?2012-01-02
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    I guess he means the angle inscribed at centre by the line joining the two points.2012-01-02
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    @NikhilBellarykar. Ahh ok. I see. He should have been more explicit.2012-01-02
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    Note that all the answers give two solutions. This is correct-the center can be either side of the bisector line.2012-01-02

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