Answer:
d = 10
Step-by-step explanation:
The standard form of an equation of a circle:
[tex](x-h)^2+(y-k)^2=r^2[/tex]
(h, k) - center
r - radius
We have the equation:
[tex](x-6)^2+(y-7)^2=25[/tex]
h = 6, k = 7, r = √25 = 5
The diameter d = 2r → d = 2(5) = 10
