@Rouben Rostamian  Sorry if I only thank you now, it was very helpful:)

@Kitonum Thank you, it was very helpful.

@Rouben Rostamian  Let's say the measures are AB=8.5cm, BC=5 cm, CA=4 cm

I would draw the segment AB. Then I would draw with a compass an arc with radius 5 cm from point A. Then I would do the same with radius 4 cm starting from point B. Once I find an intersection, I know where C is and I can draw the triangle.

@gkokovidis what if I don't know the value of any angle?