Question

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

Answer 1

@DaBest21

Answer 2

@rvc

Answer 3

@sourwing

Answer 4

@3spooky5me

Answer 5

@Flvs.net

Answer 6

anybody??

Answer 7

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

Answer 8

that will be the radius.

Answer 9

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)?

Answer 10

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

Answer 11

@Flvs.net

Answer 12

please help! @Flvs.net

Answer 13

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

Answer 14

omg no please dont do that

Answer 15

i honestly have no idea

Answer 16

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.

Answer 17

Came out wrong one sec.

Answer 18

6? xD

Answer 19

omg dude it's no use!

Answer 20

just please answer it!

Answer 21

@Flvs.net

Answer 22

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.

Answer 23

Here. You don't have to get mad.

Answer 24

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

Answer 25

like who gives a pellet

Answer 26

Well I just gave it to you so.

Answer 27

pellet* lol

Answer 28

wow it wont let me cuss xD

Answer 29

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?

Answer 30

I just did your work for you

Answer 31

thank you @Flvs.net

Answer 32

Np, peach how did you give me two medals?

Answer 33

@idontgetmath101 can you give me a medal?

Answer 34

i did @Flvs.net

Answer 35

i didn't @idontgetmath101 probably gave 1

Answer 36

Oh, okay.