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March 6th, 2013, 03:14 AM  #1 
Newbie Joined: Mar 2013 Posts: 2 Thanks: 0  Circle shared point
I need to calculate a point 2 circles share when they collide in 2 dimensions. What's the easiest way to do this? Context: The circles are spaceships with a velocity; I have already calculated the estimated image when they collide, so I have both their x and y values and radius when they collide. 
March 6th, 2013, 04:17 AM  #2 
Newbie Joined: Mar 2013 Posts: 2 Thanks: 0  Re: Circle shared point
bumping

March 6th, 2013, 08:58 AM  #3 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: Circle shared point
You should wait more than 63 minutes to bump a topic, and it may be helpful when bumping to show what your progress on the problem has been in the meantime. The two circles will touch one another (collide) when the distance between their radii is the sum of their radii. I would then use similar triangles to find the point of intersection. 

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