9. What is the equation of a circle that is tangent to both x and y axes, with a radius of 4 and
whose center is located in the second quadrant?
A. (x + 4)2 + (y - 4)2 = 16
B. (x - 4)2 + (y + 4)2 = 16
C. (x + 4)2 + (y + 4)2 = 16
D. (x - 4)2 + (y - 4)2 = 16
10. What is the equation of a circle whose center is at point (-4,6) and passes through the point
(1, 2)?
A. x2 + y2 - 8x +12y + 11 = 0
B. x2 + y2 + 8x - 12y + 11 = 0
C. x2 + y2 + 4x - 6y - 41 = 0
D. x2 + y2 - 4x + 6y - 41 = 0
11. Which of the following is a standard equation of a circle?
A. (x - 3)2 + (y + 2)2 = 16
B. (x2 - 3) - (y 2 - 2) = 16
C. (x - 3)2-(y - 2)2 = 16
D. (x 2 + 3) + (y2 + 2) = 16 7.
12. What is the equation of a circle whose center is at (-3,2) and has a radius of 11 units?
A. (x + 3)2 + (y - 2)2 = 121
B.(x - 3)2 + (y + 2)2 = 121
C. (x - 2)2 + (y + 3)2 = 121
D. (x + 2)2 + (y - 3)2 = 12116​