I really need help figuring out what is the the surface area of A, B, C

Answer:
A = 54
B = 48.27
C = 5.55
Step-by-step explanation:
1) A = 6s²
3) A = 1/2bh
1) 6(3)² = 6(9) = 54
2) 9*4 = 36 + 4.5 = 40.5 + 7.77 = 48.27
3) 1/2 (3)(3.7) = 1/2(11.1) = 5.55
Use A and C first I going to try to figure B out.