Irrational because it’s not a perfect square.
Let's assume they meant C=40 degrees. With an angle like that they're asking for approximation; we'll oblige.
The circumradius is the product of the triangle sides divided by four times the area.
Here we have remaining side given by the Law of Cosines.



The area is

The circumradius is
Answer
D $48.00 u need to multiply 216 and 12 to get 48