Equation of a Circle Answers
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1
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What is the equation of a circle with a center at (–4, 0) that passes through the point (–2, 1)?
A
x2 + (y + 4)² =
B
(x – 1)² + (y + 2)² = 5C
(x + 4)² + y² = 5D
(x + 2)² + (y – 1)² =2
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The point (0, 5) lies on a circle that is centered at the origin. Does (–3, –4) also lie on the circle?
Answers:
Identify the radius from the graph. r = units:5
Determine the distance from the center to (–3, –4) using the distance formula. distance = units:5
Compare the radius to the distance. Does the point (–3, –4) also lie on the circle?:yes
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