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I don't understand the equation for a circle.
(x  h)2 + (y  k)2 = r2
Can someone please explain it to me?
 one year ago
 one year ago
I don't understand the equation for a circle. (x  h)2 + (y  k)2 = r2 Can someone please explain it to me?
 one year ago
 one year ago

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nbouscalBest ResponseYou've already chosen the best response.2
(h,k) represents the center, and r represents the radius. To help your understanding, try coming up with a few simple circles and graphing them.
 one year ago

elizabethann509Best ResponseYou've already chosen the best response.0
I don't understand how to solve the equation when the numbers are put in
 one year ago

elizabethann509Best ResponseYou've already chosen the best response.0
For example, something like this: (x  3)2 + (y  7)2 = 25
 one year ago

CalcmathleteBest ResponseYou've already chosen the best response.1
Basically, think of it like this. (h, k) is the center right? Since it says  h and  k in the circle equation, just bypass it and reverse the sign when putting it in or taking it out of the equation. Example: (x  9)^2 + (y + 4)^2 = 9 The center is (9, 4) and the radius is 3. Just reverse the sign.
 one year ago

nbouscalBest ResponseYou've already chosen the best response.2
This is the general equation for a circle, it isn't a specific circle. For a specific circle, the h, k, and r will all be defined. So you'll have, for example, \((x1)^2+(y2)^2=5^2.\) This would be a circle centered around (1,2) with radius 5. That just means that any x and y that make the equation true are on the circle.
 one year ago

CalcmathleteBest ResponseYou've already chosen the best response.1
See how the signs are opposites?
 one year ago

elizabethann509Best ResponseYou've already chosen the best response.0
yeah that makes sense.
 one year ago
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