Formula for a circle with centre (xo, yo) and radius r is:
(x - xo)2 + (y - yo)2 = r2
Circle centre (0, 0) and radius 14:
(x - 0)2 + (y - 0)2 = 142
x2 + y2 = 196
x2 + y2 =144
x2 + y2 = 400
x² + y² = 225.
x² + y² = 64.
x2 + y2 = 25
The equation is: x2+y2 = radius2
x2 + y2 =144
x2 + y2 = 400
x² + y² = 225.
x² + y² = 64.
x² + y² = 3.
x² + y² = 100.
x² + y² = 196.
x² + y² = 16.
x² + y² = 1.
x² + y² = 49.
x² + y² = 36.