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Topic: coordinates of point on circle?
Replies: 3   Last Post: Mar 11, 1997 10:42 AM

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Posts: 4
Registered: 12/6/04
coordinates of point on circle?
Posted: Mar 10, 1997 11:48 AM
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My son is asking the following:

Given a coordinate circle with points at (0,100), (100,0), (0,-100),
and (-100,0), how does one find the coordinates of a point on the
circle? Let's assume the point (A,B) is between (0,100) and (100,0)
. The distance from (A,B) to (0,100) is also known. Thus, knowing
the radius to be 100, it would seem we could find the angle formed by
(0,100), (0,0) and (A,B). Now, how does he determine the coordinates
of (A,B)?

BTW, he is doing this for a science project in astronomy. He is doing
something involving two planets and an asteroid (detemining the effects
of the planets on the orbit of the asteroid).

Any help (or pointers to sources) would be greatly appreciated.

John Neubert

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