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find centre of circle

 
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Oct6-11, 02:41 AM   #1
 

find centre of circle

given the x,y coordinates of two points and the radius of a curve. has anyone got a formula for calculating the coordinates of the centre point please
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Oct6-11, 02:43 AM   #2
 
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Quote by bikermart View Post
given the x,y coordinates of two points and the radius of a curve. has anyone got a formula for calculating the coordinates of the centre point please
One can simply use the general equation for a circle in Cartesian coordinates.
Oct6-11, 02:49 AM   #3
 
which is ?
Oct6-11, 02:51 AM   #4
 
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find centre of circle

http://en.wikipedia.org/wiki/Circle#Equations
Oct6-11, 03:05 AM   #5
 
thats great thanks but that give me two simultaneous equations to work out.
i might be being lazy here but has anyone trawled out the formula such that given x1,y1,x2,y2 and r then a= and b= so i can just stick them in my program.
cheers.
Oct6-11, 03:12 AM   #6
 
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Quote by bikermart View Post
thats great thanks but that give me two simultaneous equations to work out.
Indeed it does. But they are not difficult.
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