Answer:
Step-by-step explanation:
The equation format of the circle is [tex](x-x_{0} )^2 +(y-y_{0} )^2 = r ^2[/tex]
In this case, r is the radius and [tex]r^{2}[/tex] is equal to 16
Thus the radius is 4. The diameter is double the radius so the diameter is 8
