find centre of circle


by bikermart
Tags: centre, circle
bikermart
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#1
Oct6-11, 02:41 AM
P: 3
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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Hootenanny
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Oct6-11, 02:43 AM
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Welcome to Physics Forums.
Quote 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.
bikermart
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#3
Oct6-11, 02:49 AM
P: 3
which is ?

Hootenanny
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Oct6-11, 02:51 AM
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find centre of circle


http://en.wikipedia.org/wiki/Circle#Equations
bikermart
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#5
Oct6-11, 03:05 AM
P: 3
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.
Hootenanny
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Oct6-11, 03:12 AM
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Quote 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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