Math
posted by Jason .
A ramp 10 feet in length rises to a loading Platform that is 4 feet off the ground. What is the angle of elevation of the ramp in degrees?
Do I use the law of cosines? When I do though I'm getting a little confused what to do.

sine = opposite/hypotenuse
sin (angle) = 0.4 
PERIMETER=2(L+B)
=
2(63+42)
=210
TOTAL COST=210*32
=672 
.4 is not the right answer.