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7-2 Circles Quiz Review

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7-2 Circles Quiz Review
Name___________________________________
Date________________ Period____
Identify the center and radius of each.
1) x 2 + y 2 = 49
2) x 2 + y 2 = 324
2
2
3) ( x + 2) + ( y − 3) = 183
4) ( x + 7) 2 + ( y + 8) 2 = 64
2
2
6) ( x + 5) + ( y − 10) = 9
2
7) x + ( y + 2) = 121
8) ( x − 14) + ( y − 2) = 4
9) 364 + 28 y + y 2 + x 2 = −26 x
10) x 2 + y 2 + 24 x + 10 y + 160 = 0
11) −6 x = − x 2 + 32 y − 264 − y 2
12) −6 x + x 2 = 97 + 10 y − y 2
5) ( x + 10) + ( y + 9) = 36
2
2
2
2
2
Identify the center and radius of each. Then sketch the graph.
2
2
2
13) ( x + 1) + ( y − 2) = 9
2
14) ( x + 2) + ( y + 3) = 4
y
−8
−6
−4
y
8
8
6
6
4
4
2
2
−2
2
4
6
8 x
−8
−6
−4
−2
2
−2
−2
−4
−4
−6
−6
−8
−8
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-1-
4
6
8 x
Worksheet by Kuta Software LLC
2
2
2
15) ( x + 1) + ( y + 2) = 25
2
16) ( x + 3) + ( y − 3) = 8
y
−8
−6
−4
y
8
8
6
6
4
4
2
2
−2
2
4
6
8 x
−8
2
−4
−4
−6
−6
−8
−8
2
( )
5
18) x +
2
y
8
−4
−2
−2
2
−6
−4
−2
17) ( x + 3) + ( y + 2) = 9
−8
−6
6
8 x
2
2
+ (y −
14 ) = 9
y
6
8
4
6
2
4
−2
4
2
4
6
2
8 x
−2
−8
−6
−4
−2
2
−4
−2
−6
−4
−8
−6
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4
6
8 x
−8
-2-
Worksheet by Kuta Software LLC
Use the information provided to write the standard form equation of each circle.
1) 8 x + x 2 − 2 y = 64 − y 2
2) 137 + 6 y = − y 2 − x 2 − 24 x
3) x 2 + y 2 + 14 x − 12 y + 4 = 0
4) y 2 + 2 x + x 2 = 24 y − 120
5) x 2 + 2 x + y 2 = 55 + 10 y
6) 8 x + 32 y + y 2 = −263 − x 2
7) Center: (−11, −8)
Radius: 4
8) Center: (−6, −15)
Radius: 5
9) ( x − 16) 2 + ( y − 6) 2 = 1
Translated 4 left, 2 up
10) ( x + 5) 2 + ( y + 7) 2 = 36
Translated 5 left, 4 down
11)
12)
y
y
7
1
6
−1
1
2
3
4
5
6 x
5
−1
4
−2
3
−3
2
−4
1
−5
−4
−3
−2
−1
1
2
3
4 x
−1
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-3-
Worksheet by Kuta Software LLC
13) Ends of a diameter: (−17, −9) and (−19, −9)
14) Ends of a diameter: (−3, 11) and (3, −13)
15) Center: (−15, 3 7 )
Area: 2π
16) Center: (−11, −14)
Area: 16π
17) Center: (−5, 12)
Circumference: 8π
18) Center: (15, 14)
Circumference: 2π 15
19) Center: (2, −5)
Point on Circle: (−7, −1)
20) Center: (14, 17)
Point on Circle: (15, 17)
21) Center: (−15, 9)
Tangent to x = −17
22) Center: (−2, 12)
Tangent to x = −5
23) Center lies on the x-axis
Tangent to x = 7 and x = −13
24) Center lies in the fourth quadrant
Tangent to x = 7, y = −4, and x = 17
25) Three points on the circle:
(−18, −5), (−7, −16), and (4, −5)
26) Three points on the circle:
(−7, 6), (9, 6), and (−4, 13)
27) x 2 + y 2 + 14 x + 12 y + 76 = 0
Translated 2 right, 4 down
28) x 2 + y 2 − 10 x + 20 y + 61 = 0
Translated 1 left, 2 down
29) x 2 + y 2 + 14 x − 8 y + 29 = 0
Translated 3 right, 4 down
30) 4 y + y 2 = −28 x − x 2 − 191
Translated 4 right
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-4-
Worksheet by Kuta Software LLC
7-2 Circles Quiz Review
Name___________________________________
Date________________ Period____
Identify the center and radius of each.
1) x 2 + y 2 = 49
2) x 2 + y 2 = 324
Center: (0, 0)
Radius: 7
Center: (0, 0)
Radius: 18
2
2
3) ( x + 2) + ( y − 3) = 183
4) ( x + 7) 2 + ( y + 8) 2 = 64
Center: (−2, 3)
Radius: 183
Center: (−7, −8)
Radius: 8
2
2
2
2
5) ( x + 10) + ( y + 9) = 36
6) ( x + 5) + ( y − 10) = 9
Center: (−10, −9)
Radius: 6
Center: (−5, 10)
Radius: 3
2
2
2
7) x + ( y + 2) = 121
2
8) ( x − 14) + ( y − 2) = 4
Center: (0, −2)
Radius: 11
Center: (14, 2)
Radius: 2
9) 364 + 28 y + y 2 + x 2 = −26 x
10) x 2 + y 2 + 24 x + 10 y + 160 = 0
Center: (−13, −14)
Radius: 1
Center: (−12, −5)
Radius: 3
11) −6 x = − x 2 + 32 y − 264 − y 2
12) −6 x + x 2 = 97 + 10 y − y 2
Center: (3, 5)
Radius: 131
Center: (3, 16)
Radius: 1
Identify the center and radius of each. Then sketch the graph.
2
2
2
13) ( x + 1) + ( y − 2) = 9
y
−6
−4
y
Center: (−1, 2)
Radius: 3
8
−8
2
14) ( x + 2) + ( y + 3) = 4
6
6
4
4
2
2
−2
2
4
6
8 x
−8
−6
−4
−2
2
−2
−2
−4
−4
−6
−6
−8
−8
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Center: (−2, −3)
Radius: 2
8
-1-
4
6
8 x
Worksheet by Kuta Software LLC
2
2
2
15) ( x + 1) + ( y + 2) = 25
y
−6
−4
y
Center: (−1, −2)
Radius: 5
8
−8
2
16) ( x + 3) + ( y − 3) = 8
6
6
4
4
2
2
−2
2
4
6
8 x
−8
−6
−4
−2
−2
−4
−4
−6
−6
−8
−8
2
2
y
Center: (−3, −2)
Radius: 3
8
( )
5
18) x +
2
−6
−4
6
8 x
2
+ (y −
14 ) = 9
(
y
Center: −
8
5
,
2
14
)
Radius: 3
4
6
2
4
−2
4
2
6
−8
2
−2
17) ( x + 3) + ( y + 2) = 9
Center: (−3, 3)
Radius: 2 2
8
2
4
6
2
8 x
−2
−8
−6
−4
−2
2
−4
−2
−6
−4
−8
−6
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4
6
8 x
−8
-2-
Worksheet by Kuta Software LLC
Use the information provided to write the standard form equation of each circle.
1) 8 x + x 2 − 2 y = 64 − y 2
2) 137 + 6 y = − y 2 − x 2 − 24 x
( x + 4) 2 + ( y − 1) 2 = 81
( x + 12) 2 + ( y + 3) 2 = 16
3) x 2 + y 2 + 14 x − 12 y + 4 = 0
4) y 2 + 2 x + x 2 = 24 y − 120
( x + 7) 2 + ( y − 6) 2 = 81
( x + 1) 2 + ( y − 12) 2 = 25
5) x 2 + 2 x + y 2 = 55 + 10 y
6) 8 x + 32 y + y 2 = −263 − x 2
( x + 1) 2 + ( y − 5) 2 = 81
( x + 4) 2 + ( y + 16) 2 = 9
7) Center: (−11, −8)
Radius: 4
8) Center: (−6, −15)
Radius: 5
( x + 11) 2 + ( y + 8) 2 = 16
( x + 6) 2 + ( y + 15) 2 = 5
9) ( x − 16) 2 + ( y − 6) 2 = 1
Translated 4 left, 2 up
10) ( x + 5) 2 + ( y + 7) 2 = 36
Translated 5 left, 4 down
( x − 12) 2 + ( y − 8) 2 = 1
( x + 10) 2 + ( y + 11) 2 = 36
12)
11)
y
y
7
1
6
−1
1
2
3
4
5
6 x
5
−1
4
−2
3
−3
2
−4
1
−5
−4
−3
−2
−1
1
2
3
4 x
−1
( x − 4) 2 + ( y + 3) 2 = 1
x 2 + ( y − 3) 2 = 9
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-3-
Worksheet by Kuta Software LLC
13) Ends of a diameter: (−17, −9) and (−19, −9)
14) Ends of a diameter: (−3, 11) and (3, −13)
( x + 18) 2 + ( y + 9) 2 = 1
16) Center: (−11, −14)
Area: 16π
15) Center: (−15, 3 7 )
Area: 2π
17)
( x + 15) 2 + ( y − 3
Center: (−5, 12)
x 2 + ( y + 1) 2 = 153
2
7) = 2
18)
( x + 11) 2 + ( y + 14) 2 = 16
Center: (15, 14)
Circumference: 8π
Circumference: 2π 15
( x + 5) 2 + ( y − 12) 2 = 16
( x − 15) 2 + ( y − 14) 2 = 15
19) Center: (2, −5)
Point on Circle: (−7, −1)
20) Center: (14, 17)
Point on Circle: (15, 17)
( x − 2) 2 + ( y + 5) 2 = 97
21) Center: (−15, 9)
Tangent to x = −17
( x − 14) 2 + ( y − 17) 2 = 1
22) Center: (−2, 12)
Tangent to x = −5
( x + 15) 2 + ( y − 9) 2 = 4
23) Center lies on the x-axis
Tangent to x = 7 and x = −13
( x + 2) 2 + ( y − 12) 2 = 9
24) Center lies in the fourth quadrant
Tangent to x = 7, y = −4, and x = 17
( x + 3) 2 + y 2 = 100
25) Three points on the circle:
(−18, −5), (−7, −16), and (4, −5)
( x − 12) 2 + ( y + 9) 2 = 25
26) Three points on the circle:
(−7, 6), (9, 6), and (−4, 13)
( x + 7) 2 + ( y + 5) 2 = 121
( x − 1) 2 +
(
y−
47
7
)
2
=
3161
49
27) x 2 + y 2 + 14 x + 12 y + 76 = 0
Translated 2 right, 4 down
28) x 2 + y 2 − 10 x + 20 y + 61 = 0
Translated 1 left, 2 down
( x + 5) 2 + ( y + 10) 2 = 9
( x − 4) 2 + ( y + 12) 2 = 64
29) x 2 + y 2 + 14 x − 8 y + 29 = 0
Translated 3 right, 4 down
30) 4 y + y 2 = −28 x − x 2 − 191
Translated 4 right
( x + 4) 2 + y 2 = 36
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( x + 10) 2 + ( y + 2) 2 = 9
-4-
Worksheet by Kuta Software LLC
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