SOLUTION: I'm really lost. Please help. find the center and radius of the circle with the given equation. x^2+y^2-28=0 All help is appreciated!

Algebra ->  Circles -> SOLUTION: I'm really lost. Please help. find the center and radius of the circle with the given equation. x^2+y^2-28=0 All help is appreciated!      Log On


   

Question 530393: I'm really lost. Please help.
find the center and radius of the circle with the given equation.
x^2+y^2-28=0
All help is appreciated!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2%2By%5E2-28=0


x%5E2%2By%5E2=28


%28x-0%29%5E2%2B%28y-0%29%5E2=%28sqrt%2828%29%29%5E2


The equation is now in %28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2 form, which is a circle, where h=0, k=0 and r=sqrt%2828%29


Remember that the center is (h,k) and the radius is r.


So the center is (0,0) and the radius is sqrt%2828%29 units.


If you need more help, email me at jim_thompson5910@hotmail.com

Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you

Jim