me assume yuno the angel tween the 2 sides yuno . . . yu gotta du differ stuf if its a different angel . . . me hav habit tu make the base the longer av 2 sides yuno . . . tu make zampel eezeeer, let base=20, side2=15, angel 30 deg . . . then hite=side2*sine(angel)...15*sine(30 deg)=15/2=7.5 . . . Make smaller triangel with vertikal line down from the top . . . (this line is the hite). leng av line along base from left side tu vertikal line is . . . line2*kosine(angel)=15*kosine(30 deg)=15*0.866025403 . . . =12.99038106. . . . Top av triangel=(12.99038106, 7.5) . . . now yukan get side 3.