Given the center
and the radius
of a circle, its equation is

In your case, the center is (-4,0), and the radius is 2. Plug these values into the generic formula and you'll get the equation.
Answer:
r can be any number -1.5 to 9.4999999
Step-by-step explanation:
Answer:
1/3
Step-by-step explanation:
The mad scientist needs one-third or 1/3 of the eyeball.
That is 1/3 of the eyeball.