anonymous
  • anonymous
Write the equation for the locus of points 3 units from the point ( 0,1) .
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
i gave you the equation of a circle earlier i think x^2+(y-1)^2=3^2
anonymous
  • anonymous
so for one unit from the point ( -1,0) it would be (x-1)^2 + (y-0)^2=1 ? @dockworker ?
anonymous
  • anonymous
(x+1)^2+y^2=1^2

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anonymous
  • anonymous
(h,k) is the center, but there is a minus sign in front of h and k in the equation of a circle, so if h or k is negative, change to addition sign
Directrix
  • Directrix
Is this an "in the plane" or an "in space" locus problem?
anonymous
  • anonymous
oh and noooo ....
anonymous
  • anonymous
thanks again @dockworker
anonymous
  • anonymous
yw
anonymous
  • anonymous
in space ? what does that mean ? @directrix
Directrix
  • Directrix
I was thinking about the problem: What is the locus of points 3 units from a given point? In 2-D, the locus is a circle. In 3-D, it is a sphere. In your problem, the coordinates of the given point are in 2-D (just two coordinates for the point) so I'm thinking that the locus is a circle in 2-D with equation as has been settled upon.
anonymous
  • anonymous
oh ok ... well my teacher hasnt taught me that yet ''/ @directrix
Directrix
  • Directrix
Okay. Over at the link given below, scroll down a bit and you can get an idea of the 2-D and 3-D difference in such a problem. http://www.mathsisfun.com/sets/set-of-points.html
anonymous
  • anonymous
@directrix thanks for the link and for introducing me to something new !!

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