The general equation for the circle - or one of them - is:
(x - a)^2 + (y - b)^2 = r^2
Where:
a and b are the coordinates of the center
r is the radius
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Equation of any circle, with any radius, and its center at any point: [ x - (x-coordinate of the center) ]2 + [ y - (y-coordinate of the center) ]2 = (radius of the circle)2
The general equation of a circle is given by the formula(x - h)2 + (x - k)2 = r2, where (h, k) is the center of the circle, and r its radius.Since the center of the circle is (0, 0), the equation reduces tox2 + y2 = r2So that the equation of our circle is x2 + y2 = 36.
Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)
depending on the circles equation..a larger circle is easier
The equation of the circle is: (x+3.2)^2 +(y+2.1)^2 = 18.49