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)
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Falco276
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@.Sam.
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@aaronq
@lalokio
Falco276
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@hba
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Falco276
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But what's the answer!?
Falco276
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I'm confused!!!!!!!!!!!!
anonymous
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\[(x-h)^2+(y-k)^2=r^2\] is the equation of a circle with radius \(r\) and center \((h,k)\)
anonymous
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in your case \(r^2=64\)
what is \(r\) ?
Falco276
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And how do I translate that into the real equation?
Falco276
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I actuall don't know what R is. :/
anonymous
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\[(x-h)^2+(y-k)^2=r^2\\(x-5)^2+(y+2)^2=64\] look almost identical
Falco276
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okay, so it's 64. Right?
anonymous
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\(r^2\) is 64 but you are asked for the radius, which is \(r\)
what number would you square to get 64?
Falco276
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8?
anonymous
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yes
Falco276
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so that's the answer, right?
8?
Falco276
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hello? :(
anonymous
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yes
Falco276
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okay, thanks. :)
anonymous
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\(64=8^2\) so \(r=8\)
yw
Falco276
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thanks. :)
Falco276
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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
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Falco276
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(this one is also not multiple choice.)
Loser66
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post at a new post, friend