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:) first measure it vertically then horizontally
A chord of a circle that contains the center of the circle is called the diameter.
the radius is from the center of the circle to the edge so that's how you find the radius.
This is the center of the circle. From the center of the circle, all the points on the circle are equally distant.
Equation of the circle: (x-3)^2 +( y+13)^2 = 169