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A circle in the XY-plane has center (5, 7) and radius 2. Which of the following is an equation of the circle?

A circle in the XY-plane has center (5, 7) and radius 2. Which of the following is-example-1
User Mafei
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Answer: A, because the equation of a circle is
(x-h)^2+(y-k)^2=r^2. So, if the point of the center is
(5,7) and the radius
2 , then on the equation should be changed as negative and the radius should be multiplied as
4, which is
(x-5)^2+(y-7)^2=4

User SmuggledPancakes
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