Question

HOW DO I FIND THE X???
http://assets.openstudy.com/updates/attachments/518e17ece4b062a8d1da595c-mathslover-1368267382806-hm.png

Answer 1

to get θ, use the defined of
sinθ = (20√3)/40 = 1/2 √3
θ = 60 °

Answer 2

and to get x, use value cosθ (θ=60°)
cosθ = x/40
cos60° = x/40
1/2 = x/40
x = 20 m