Answer:
x^2+y^2=16
Explanation:
x^2+y^2=r^2 is the mother function of the equation of a circle centered at r with radius r
since r is defined to be 4 and 4^2 is 16 therefore, the equation would then be
(x)^2 + (y)^2 = 4^2
The standard form of an equation for a circle is
(x-h)^2 + (y-k)^2 = r^2
where (h,k) is the center and r is the radius
Since the center is 0,0 and the radius is 4
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