Answer:
Step-by-step explanation:
distance between ( 3 , 9 ) and ( 3 , - 3 ) = 9 - (-3) = 12 because x is the same for both pts
12 is the diameter of circle so its radius = 12/2 = 6
center is in the middle: ( 3 , (9-3)/2 ) = ( 3, 3 )
so the circle's eqn is
( x - 3 )^2 + ( y - 3 )^2 = 6^2
