HELP! 1. Find the coordinates of the center and the measure of the diameter for a circle whose equation is
(x + 8)2 + (y - 4)2 = 81

2. Find the coordinates of the center and the measure of the radius for a circle whose equation is
(x - 8)2 + (y + 4)2 = 12

3. Find the coordinates of the center and the measure of the radius for a circle whose equation is
x2 + (y - 5)2 = 9

4. Find the coordinates of the center and the measure of the radius for a circle whose equation is
(x + 4)2 + (y + 5)2 = 64

5. Find the coordinates of the center and the measure of the radius for a circle whose equation is
(x - 7)2 + (y - 3)2 = 144

6. Write the equation of a circle whose center is (0,-5) and radius is 7.

7. Write the equation of a circle whose center is (6,-1) and diameter is 12.

8. Write the equation of a circle whose center is (-2,3) and radius is 4.

9. Find the radius of a circle whose center is (0,3) and a y-intercept of (0,7).