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Answer to Question #988 in Geometry for ibax

Question #988
Find the centre and the radius of the given circles:

1. (x-1)2 +(y+1)2 = 1
2. x2 +y2 = 4
Expert's answer
The equation of the circle is (x-a)2 + (y-b)2 = R2, where (a,b) - are the coordinates of the center, R - radius.
Thus
1. (1,-1) - the centre, R = 1
2. (0,0) - the centre, R = 2

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