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 March 23rd, 2009, 11:19 PM #1 Newbie   Joined: Mar 2009 Posts: 1 Thanks: 0 How to find the angle for a given point in a circle Hi, How to find the angle for any given point in the circle. Thanks in advance.
 March 24th, 2009, 05:57 AM #2 Senior Member   Joined: Mar 2009 Posts: 318 Thanks: 0 Use the "inverse" trig-function keys on your calculator...?
 March 24th, 2009, 06:04 AM #3 Senior Member   Joined: Sep 2008 Posts: 116 Thanks: 0 Re: How to find the angle for a given point in a circle Are we talking about a coordinate point on a circle centered on the origin (0,0)? If so, then the angle represented by the one formed between a line drawn from the point to the origin with the x-axis is represented by: $\theta= tan^{-1}(\frac{y}{x})$
March 24th, 2009, 01:02 PM   #4
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Re: How to find the angle for a given point in a circle

Quote:
 Originally Posted by From PM Assume that u know the radius, x,y point. how do u find the angle to the point x,y from the center of the circle. Center is at (0,0).
Ok. What we're going to do is make a triangle inside the circle.

Put this point on a graph, and the distance from the center (0,0) to (X,Y) is r. This is your hypotenuse of the triangle.

$tan^{-1}(Y/X)= \theta$

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# given a point on a circle find angle

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