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elizabethann509
Group Title
I don't understand the equation for a circle.
(x  h)2 + (y  k)2 = r2
Can someone please explain it to me?
 2 years ago
 2 years ago
elizabethann509 Group Title
I don't understand the equation for a circle. (x  h)2 + (y  k)2 = r2 Can someone please explain it to me?
 2 years ago
 2 years ago

This Question is Closed

nbouscal Group TitleBest 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.
 2 years ago

elizabethann509 Group TitleBest ResponseYou've already chosen the best response.0
I don't understand how to solve the equation when the numbers are put in
 2 years ago

elizabethann509 Group TitleBest ResponseYou've already chosen the best response.0
For example, something like this: (x  3)2 + (y  7)2 = 25
 2 years ago

Calcmathlete Group TitleBest 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.
 2 years ago

nbouscal Group TitleBest 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.
 2 years ago

Calcmathlete Group TitleBest ResponseYou've already chosen the best response.1
See how the signs are opposites?
 2 years ago

elizabethann509 Group TitleBest ResponseYou've already chosen the best response.0
yeah that makes sense.
 2 years ago
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