Answer:
The circle is of radius and is centered at .
Step-by-step explanation:
Equation for a circle of radius () and center :
.
Expand and rearrange to obtain an equivalent equation:
Compare this equation with the equation of the circle in this question:
Assume that the proposed equation matches the equation from the question. Each of the coefficients should match.
From the coefficient of the term and the term: and .
Hence, the center of this circle is at .
The constant term of the two equations should also match: .
(given that radius .)
Hence, the radius of this circle would be .
16/4=4
when you divide 16/4 it gives you 4