What is the general form of the equation of a circle with its center at (-2, 1) and passing through (-4, 1)?
x2 + y2 − 4x + 2y + 1 = 0
x2 + y2 + 4x − 2y + 1 = 0
x2 + y2 + 4x − 2y + 9 = 0
x2 − y2 + 2x + y + 1 = 0

- anonymous

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- anonymous

@DaBest21

- anonymous

@rvc

- anonymous

@sourwing

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## More answers

- anonymous

@3spooky5me

- anonymous

@Flvs.net

- anonymous

anybody??

- anonymous

what's the distance between (-2, 1) and (-4, 1)

- anonymous

that will be the radius.

- anonymous

2 is the distance. so 2 is the radius.
So what's the equation for a circle with radius 2 and center at (-2, 1)?

- anonymous

you've been asking these circle questions all day, and on just about every one of them someone's posted the equation where all you have to do is plug in the radius and center, and you always say you understand. please don't tag me if you're not even willing to make an attempt. This isn't my homework

- anonymous

@Flvs.net

- anonymous

please help! @Flvs.net

- Flvs.net

I'm here. So what do you think the answer is?

- anonymous

omg no please dont do that

- anonymous

i honestly have no idea

- Flvs.net

Standard form equation for a circle with center (h,k) and radius r is:
(x−h) 2 +(y−k) 2 =r 2
So you have the center, now you just need the radius. Well, given the center and a point on the circle, the radius is just the distance between those 2 points. so use the distance formula to find the distance between those 2 points, which is your r:
d=(x 1 −x 2 ) 2 +(y 1 −y 2 ) 2 − − − − − − − − − − − − − − − − − − √
Then plug your center point coordinates, and your r, back into the circle equation that I gave you above.

- Flvs.net

Came out wrong one sec.

- anonymous

6? xD

- anonymous

omg dude it's no use!

- anonymous

just please answer it!

- anonymous

@Flvs.net

- Flvs.net

Standard form equation for a circle with center (h,k) and radius r is:
\[(x−h) ^{2} +(y−k) ^{2} =r ^{2}\]
So you have the center, now you just need the radius. Well, given the center and a point on the circle, the radius is just the distance between those 2 points. so use the distance formula to find the distance between those 2 points, which is your r:
\[d=\sqrt{(x _{1} −x _{2} ) ^{2} +(y _{1} −y _{2} ) ^{2} } \]
Then plug your center point coordinates, and your r, back into the circle equation that I gave you above.

- Flvs.net

Here. You don't have to get mad.

- anonymous

lol im not mad it's just i hate how people are so annoying on here about not giving the stupid answers

- anonymous

like who gives a pellet

- Flvs.net

Well I just gave it to you so.

- anonymous

pellet* lol

- anonymous

wow it wont let me cuss xD

- anonymous

It's not just about not giving answers. You do realize that someone has to actually solve the problem right? Why should someone else put the effort in to do YOUR work?

- Flvs.net

I just did your work for you

- anonymous

thank you @Flvs.net

- Flvs.net

Np, peach how did you give me two medals?

- Flvs.net

@idontgetmath101 can you give me a medal?

- anonymous

i did @Flvs.net

- anonymous

i didn't @idontgetmath101 probably gave 1

- Flvs.net

Oh, okay.

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