Respuesta :

circles follow ghe equations
(x-h)^2 + (y-k)^2 =r^2
with center (h,k) and radius r
for this circle it would be
(x-7)^2 + (y-4)^2 = 100
If the diameter is 10, then the radius is 5. (x-7)² + (y-4)² = 5² 
The answer is (x-7)² + (y-4)² = 25