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Enter the equation of the circle described below.
Center (0, 0), radius = 4

The standard equation of a unit circle is

x²+y²=1

So, if we want a radius of 4, we need to square it.

so we have x²+y²=16

x^2 + y^2 = 16

Step-by-step explanation:

The equation of a circle is given by

(x-h)^2 + (y-k)^2 = r^2  where (h,k) is the center and r is the radius

(x-0)^2 + (y-0)^2 = 4^2

x^2 + y^2 = 16

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1