fleurilie
fleurilie fleurilie
  • 21-12-2015
  • Mathematics
contestada

What is the radius of the circle shown below (and how did you solve it)?
[tex] x^{2} + y^{2} -12x -6y +9=0[/tex]

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elishamarsh
elishamarsh elishamarsh
  • 22-12-2015
so you rearrange it as two separate equations to complete the square so 
(x-6)^2 -36 + (y-3)^2 - 9 +9 = 0
then move the integers to the other side so its in the right format for the equation of a circle and root it
so radius is 6
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