1.
Find an equation of the circle whose center is at (-2, 4) and has radius 5.
A.
(
x
- 2)
2
+ (
y
+ 4)
2
= 5
B.
(
x
+ 2)
2
+ (
y
- 4)
2
= 5
C.
(
x
+ 2)
2
+ (
y
- 4)
2
= 25
D.
(
x
- 2)
2
+ (
y
+ 4)
2
= 25
Hint
2.
Find an equation of a circle if the endpoints of a diameter are at (-2, -3) and (1, 7).
A.
(
x
- 1)
2
+ (
y
- 7)
2
= 109
B.
C.
(
x
+ 2)
2
+ (
y
+ 3)
2
= 109
D.
Hint
3.
Find the coordinates of the center of a circle with equation
x
2
+
y
2
- 2
x
+ 8
y
+ 13 = 0.
A.
(1, -4)
B.
(-1, 4)
C.
(1, 4)
D.
(-1, -4)
Hint
4.
Find the radius of a circle with the equation
x
2
+
y
2
+ 6
x
- 10
y
+ 28 = 0.
A.
5
B.
C.
6
D.
3
Hint
5.
Find an equation for the graph below.
A.
(
x
- 4)
2
+ (
y
+ 1)
2
= 4
B.
(
x
+ 4)
2
+ (
y
- 1)
2
= 2
C.
(
x
+ 4)
2
+ (
y
- 1)
2
= 4
D.
(
x
- 4)
2
+ (
y
+ 1)
2
= 2
Hint