# Circle

From the equation of a circle:

$2x2 +2y2 +20x -20y +68 = 0$

Calculate the coordinates of the center of the circle S[x0, y0] and radius of the circle r.

Result

x0 =  -5
y0 =  5
r =  4

#### Solution:

$(x -x_0)^2+(y -y_0)^2 = r^2 \ \\ (x +5)^2+(y -5)^2 = 4^2 \ \\ \ \\ x_0=-5 \ \\ y_0=5 \ \\ r=4$

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