Equation of a Circle Answers
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1
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Distance formula:
A
Yes, the distance from (3, 0) to (0, 0) is 3 units.B
Yes, the distance from (0, 0) to (2, ) is 3 units.
C
No, the distance from (3, 0) to (2, ) is not 3 units.D
No, the distance from (0, 0) to (2, ) is not 3 units.2
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On a coordinate plane, a circle has a center at (4, 5) and a radius of 3 units.
A
(x – 4)2 + (y – 5)2 = 2B
(x – 4)2 + (y – 5)2 = 4C
(x – 5)2 + (y – 4)2 = 2D
(x – 5)2 + (y – 4)2 = 43
Which equation represents a circle that contains the point (–5, –3) and has a center at (–2, 1)? Distance formula:
A
(x – 1)2 + (y + 2)2 = 25B
(x + 2)2 + (y – 1)2 = 5C
(x + 2)2 + (y – 1)2 = 25D
(x – 1)2 + (y + 2)2 = 54
Which explains how to find the radius of a circle whose equation is in the form x2 + y2 = z?
A
The radius is the constant term, z.B
The radius is the constant term, z, divided by 2.C
The radius is the square root of the constant term, z.D
The radius is the square of the constant term, z.Did you find these answers helpful?
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