Chapter 10 Part 2 Unit TEST: Circles Answers
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What is the radius of a circle whose equation is x2+y2+8x−6y+21=0?
A
2 unitsB
3 unitsC
4 unitsD
5 units2
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What is the radius of a circle whose equation is (x – 7)2 + (y – 10)2 = 4?
A
2 unitsB
4 unitsC
8 unitsD
16 units3
What is the center of a circle represented by the equation (x+9)2+(y−6)2=102?
A
(−9,6)B
(−6,9)C
(6,−9)D
(9,−6)4
Two circles are concentric if they have the same center.
A
(x – 4)2 + (y – 6)2 = 4B
(x – 4)2 + (y – 6)2 = 16C
(x – 6)2 + (y – 4)2 = 16D
(x – 6)2 + (y – 4)2 = 4Did you find these answers helpful?
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