Name ______________________Date ____________Score ____ / 12
Equation of a circle practice
Equation of a circle · 1–12
Write the equation, or find the center and radius.
1.(x + 1)2 + (y − 8)2 = 9
2.(x + 2)2 + (y + 8)2 = 36
3.(x − 9)2 + (y + 1)2 = 1
4.(x − 7)2 + (y + 1)2 = 100
5.(x + 2)2 + (y − 7)2 = 4
6.(x + 1)2 + (y + 4)2 = 49
7.(x + 5)2 + (y + 8)2 = 1
8.(x − 7)2 + (y − 9)2 = 1
9.(x + 5)2 + (y + 7)2 = 36
10.(x + 9)2 + (y − 2)2 = 25
12.(x + 8)2 + (y − 5)2 = 16
Answer key — Equation of a circle practice
Equation of a circle
1.center (−1, 8), radius 3
2.center (−2, −8), radius 6
3.center (9, −1), radius 1
4.center (7, −1), radius 10
5.center (−2, 7), radius 2
6.center (−1, −4), radius 7
7.center (−5, −8), radius 1
8.center (7, 9), radius 1
9.center (−5, −7), radius 6
10.center (−9, 2), radius 5
11.center (−8, 0), radius 9
12.center (−8, 5), radius 4
mathsheetstudio.commathsheetstudio.commathsheetstudio.commathsheetstudio.commathsheetstudio.commathsheetstudio.commathsheetstudio.commathsheetstudio.com