Falco276
  • Falco276
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The equation of a circle is shown below. (x -5)2 + (y + 2)2 = 64 The radius of the circle is ________ units. (No Multiple Choice)
Mathematics
jamiebookeater
  • jamiebookeater
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Falco276
  • Falco276
@.Sam. @andriod09 @Gin_Ichimaru @ganeshie8 @Hunter15 @Creation @aaronq @lalokio
Falco276
  • Falco276
@hba @Frostbite @Hero @lexi14 @phi @Meriam
phi
  • phi
http://www.mathwarehouse.com/geometry/circle/equation-of-a-circle.php

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Falco276
  • Falco276
But what's the answer!?
Falco276
  • Falco276
I'm confused!!!!!!!!!!!!
anonymous
  • anonymous
\[(x-h)^2+(y-k)^2=r^2\] is the equation of a circle with radius \(r\) and center \((h,k)\)
anonymous
  • anonymous
in your case \(r^2=64\) what is \(r\) ?
Falco276
  • Falco276
And how do I translate that into the real equation?
Falco276
  • Falco276
I actuall don't know what R is. :/
anonymous
  • anonymous
\[(x-h)^2+(y-k)^2=r^2\\(x-5)^2+(y+2)^2=64\] look almost identical
Falco276
  • Falco276
okay, so it's 64. Right?
anonymous
  • anonymous
\(r^2\) is 64 but you are asked for the radius, which is \(r\) what number would you square to get 64?
Falco276
  • Falco276
8?
anonymous
  • anonymous
yes
Falco276
  • Falco276
so that's the answer, right? 8?
Falco276
  • Falco276
hello? :(
anonymous
  • anonymous
yes
Falco276
  • Falco276
okay, thanks. :)
anonymous
  • anonymous
\(64=8^2\) so \(r=8\) yw
Falco276
  • Falco276
thanks. :)
Falco276
  • Falco276
Wait guys, I have another question. segment PR has an endpoint at (25, -5) and a midpoint of (18, -1). What is the value of the x-coordinate of the other endpoint?
Falco276
  • Falco276
@satellite73 @Loser66 @geoffb
Falco276
  • Falco276
(this one is also not multiple choice.)
Loser66
  • Loser66
post at a new post, friend

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