Question

http://tinypic.com/r/2dkz987/5

Write the standard equation of the circle below
answers :
(x - 1)2 + (y + 2)2 = 9
(x + 1)2 + (y - 2)2 = 3
(x - 1)2 + (y + 2)2 = 3
(x + 2)2 + (y - 1)2 = 9

Answer 1

i think its the second one.. not sure

Answer 2

Equation of a circle \[(x-h)^2+(y-k)^2=r^2\]

Answer 3

(h,k) is the center (red dot) of your circle
r=radius

Answer 4

so i dont get the radius?

Answer 5

h is 1 and k is -2 right

Answer 6

yeah, to get r just count horizontsally from the red dot to the outside of the circle

Answer 7

so itd be 6 then ? >.<

Answer 8

\[(x-1)^2+(y-(-2))^2=(x-1)^2+(y+2)^2\] and no it'd be 3

Answer 9

yeah i got it lol do you multipy the 3 ?

Answer 10

ijs we already have this much and we know its a number squareed (9) so you could just choose the answer there

Answer 11

and yeah its 3 squared=9

Answer 12

so itd be the first one ??

Answer 13

you got it

Answer 14

yaaay thanks ! (: