anonymous
  • anonymous
What is the general form of the equation for the given circle?
Geometry
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anonymous
  • anonymous
What is the general form of the equation for the given circle?
Geometry
katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous
do you know the equation for a circle centered at origin?
anonymous
  • anonymous
x2+y2+r2

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anonymous
  • anonymous
or just the general form
anonymous
  • anonymous
Do you know the general form?
anonymous
  • anonymous
oh and that should be = r^2 not plus r^2
anonymous
  • anonymous
thats what i meant
anonymous
  • anonymous
(x-h)^2 + (y-k)^2 = r^2 is the general form
anonymous
  • anonymous
(h,k) is the origin so you need to figure out what the origin is
anonymous
  • anonymous
Do you know what it is?
anonymous
  • anonymous
how do i find it?
anonymous
  • anonymous
do you know the equation of the vertical and horizontal lines?
anonymous
  • anonymous
4 & 7??
anonymous
  • anonymous
the form for the equation of a vertical line is x=c (c is a constant) horizontal is is y=c
anonymous
  • anonymous
so the vertical line is x=4
anonymous
  • anonymous
and the horizontal line is y=4
anonymous
  • anonymous
so your origin is (4,4)
anonymous
  • anonymous
now you need to find the radius and plug into the equation for a circle
anonymous
  • anonymous
is the radius 5?
anonymous
  • anonymous
no. How did you get 5?
anonymous
  • anonymous
i dont understand how to get it
anonymous
  • anonymous
the radius is the distance from the origin to an endpoint on the circle
anonymous
  • anonymous
9
anonymous
  • anonymous
how did you get 9?
anonymous
  • anonymous
subtract the y coordinate of the origin from the y coordinate of the endpoint connected by the vertical line
anonymous
  • anonymous
4-4?
anonymous
  • anonymous
that would be subtracting the x coordinate from the y coordinate.
anonymous
  • anonymous
try drawing the circle on graph paper with origin (4,4) and it should become clear

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