Math Is Fun Forum

denis_gylaev

Member

Registered: 2015-03-19

Posts: 66

Trouble with circles

I don't know where to go with this problem. Please advise.

The equation of the circle that passes through (-1,6) and which has a center at (2,3) can be written as

Find

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trouble with circles

Hi;

Use the distance formula on the points (-1,6) and (2,3) you will get

this will be r.

Then take the equation of a circle:

where h and k are the center of the circle.

I am sure you can finish from here.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

denis_gylaev

Member

Registered: 2015-03-19

Posts: 66

Re: Trouble with circles

Thank you for your help - I ended up getting

and then

which is -120.

Last edited by denis_gylaev (2017-04-11 00:28:04)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Trouble with circles

Hi;

Did you check the answer?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

denis_gylaev

Member

Registered: 2015-03-19

Posts: 66

Re: Trouble with circles

Yes, it is correct. Thank you.