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
63 initially
Tonya is running a marathon she ran 12 miles she had 51 miles left now many miles is the whole marathon
-7x-5v^4+5+7x^4+5+9x-=
2x^4+2x+10