Help. ​

We need to find the radius

Circumference = 2 pi * r

37.68   =  2pi *r         divide both sides by 2pi

37.68/ (2pi)  = r

The  surface area  =  4 pi r^2......sub "r"  into this and we get

4pi  [ 37.68 / (2pi) ] ^2  ≈  451.9 km^2

OK, NSS.......good to see that you're catching on to some of this stuff......