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
= 25
C.
(
x
- 2)
2
+ (
y
+ 4)
2
= 25
D.
(
x
+ 2)
2
+ (
y
- 4)
2
= 5
Hint
2.
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
3.
Find the radius of a circle with the equation
x
2
+
y
2
+ 6
x
- 10
y
+ 28 = 0.
A.
5
B.
6
C.
D.
3
Hint
4.
Write the equation
in standard form.
A.
B.
C.
D.
Hint
5.
Which of the following could be the center of a circle that is tangent to the lines
y
= 3 and
x
= –2?
A.
(2, 1)
B.
(-3, 1)
C.
(0, 0)
D.
(2, -1)
Hint