Circle P has a radius of 8 units with center P at (2, 1). Which equation defines circle P?

Question

anonymous · Answer

the equation of a circle in standard form is (x-h)^2 + (y-k)^2 = r^2
where (h,k) is your center and radius of r.

anonymous · Answer

just plug those values into the equation and you have it....

anonymous · Answer

Um what is H and K?

anonymous · Answer

h is the x coordinate of your center
k is the y coordinate of your center

anonymous · Answer

they're given to you...
and so is the radius r.

anonymous · Answer

oh sorry, So would the answer be (x+2)^2 + (y+1)^2=64?

anonymous · Answer

almost...
but not quite... try again...

anonymous · Answer

btw, that one that you just posted is a circle centered at (-2, -1) and radius 8

anonymous · Answer

so it is (x – 2)^2 + (y – 1)^2 = 64 then? I think i see how i messed up.

anonymous · Answer

yep... good work man...  :)

anonymous · Answer

Woo! Thank you show much for your help. I understand it now.

anonymous · Answer

yw