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24-08-2017
Mathematics

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If the center is (2,-1) and the radius is 5 what is the equation ?

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mreijepatmat mreijepatmat

24-08-2017

The standard equation of a circle:

(y-k)² + (x-h)² = R² (1), where R is the radius and h, k are the coordinates of the center.: C(h, k)
In the problem the coordinates of the center C(2,-1).
Replace in (1) h by 2 and k by -1:

(y+1)² + (x-2)² = 25

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