Thread: finding radius/center of circle

find the radius r and the center (h,k) of the following circle
2 2
3 (x-3) + 3y =75

Originally Posted by shawn9356

find the radius r and the center (h,k) of the following circle
2 2
3 (x-3) + 3y =75

do you mean ?

if so, note that this is:

Now, when a circle is written in the form , the center is and the radius is . i leave the rest to you

Hi !

Originally Posted by shawn9356

find the radius r and the center (h,k) of the following circle
2 2
3 (x-3) + 3y =75

Use ^2 to write exponents

You know that the equation of a circle, of center and of radius R is :



Therefore, try to make appear that form.

The reflex will be to divide the whole equation you have by 3, in order to get

Then, note that .
Recognize in your equation and R