Loading...

#33606

scale

circles

geometry

easy

30 sec

Circle A in the $x y$ -plane has the equation $(x - 3)^{2} + (y + 1)^{2} = 9$ . Circle B has the same center as circle A. The radius of circle B is three times the radius of circle A. The equation defining circle B in the $x y$ -plane is $(x - 3)^{2} + (y + 1)^{2} = k$ , where $k$ is a constant. What is the value of $k$ ?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.