anonymous
  • anonymous
how do you write the equation of a circle with given center and radius
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
(x-a)^2 + (y-b)^2 = r^2 Where r = radius, (a,b) = centre co-ordinates
anonymous
  • anonymous
thanks can you show me an example
anonymous
  • anonymous
(x-2)^2 + (y+3)^2 = 25 Is a circle, centre (2,-3), radius 5

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anonymous
  • anonymous
(x^2-4x+4)+(y^2+6x+9)=25 what next!
anonymous
  • anonymous
6x most be 6y
anonymous
  • anonymous
You could bring all the constants, on to the right and side, but the form I gave it in in generally what is needed, and the simplest (if you want cartesian, that is)
anonymous
  • anonymous
You just have to factor those two terms and you will get it back into the above form
anonymous
  • anonymous
OK. well I'm a cape student but my teacher is holding back and the time is going so im going ahead by my self
anonymous
  • anonymous
That sounds like fun.
anonymous
  • anonymous
yea its fun but difficult at times

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