A or B. its a 50/50 here. I can't really tell whats on the graph.
Cosθ = adjacent / hypotenuse

I hope I helped you^_^
B the plane has only one dimension
3/4 x 2/1 = 6/4
Simplify:
6/4 = 3/2
So, 3/2 or 1.5
A^3=343 in^3
take the cubic root
a=7
Perimeter= 7in+7in+7in+7in=28inch