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March 23rd, 2009, 11:19 PM   #1
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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.
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March 24th, 2009, 05:57 AM   #2
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Use the "inverse" trig-function keys on your calculator...?
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March 24th, 2009, 06:04 AM   #3
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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:
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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.

So you have your circle, with point (X,Y) and radius r.

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.

The distance X is your length, and your height Y is the height of your triangle.

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