http://www.ultimacalc.com/html/Triangles_1.html

this goes from drawing a triangle to completion of sides and angles. More of use to you?

edit: sorry for not of being more use. I dont have a calc and cant solve sine/cosine in my head. But I'm pretty sure you can draw a line down your ABC unknown triangle ending with two different triangles. Then solve each triangle using the 90 degree line you drew in. Total the triangle has to =180 degrees so having the total angle measurement, plus the two known 90 angles should be all you need...If you need more info give me a little bit and Ill find a calc and draw it out.