The standard form of a circle is:

Your center is
and your radius is 
Plug them into the equation and you get


The correct answer is D.
A) 8^2 + 12^2=c^2
c= 4(13) or 14.42
B) 8^2 + b^2=12^2
b=4(5) or 8.94
Answer:
25
Step-by-step explanation:
486.12 as fraction is 12153/25
HOPE THIS HELPS