Using degrees to find the value of x in a triangle.

I would believe at least one side is given. To find the other angles, you might want to you either sine, cosines or tangent.

Sinθ = opposite (opp) / Hypothenuse (hyp)

Cosθ = adjacent (adj) / Hypothenuse (hyp)

Tanθ = opposite (opp) / adjacent (adj)

where θ is the known angle.

you could also use the above to find the length of the unknown sides.

Also so remember the sum angles if a triangle is 180.