I am completely new in 3D Design/CAD. That said, I measured out a shape to create, drew the lines and typed in the dimensions. With the last 3-4 lines I noticed that the angles are not correct so the lines don't fit correctly. I figured to just finish the sketch and then move stuff around for the right angle. The problem is that I can't edit anything in the sketch apart from two lines, everything else including angles has parentheses around it and cannot be changed with typing. Grabbing an endpoint and moving displays the angle but not the length, which made it almost impossible to create the shape. Last resort was essentially to remove lines, build again from a point that was correct, over and over until the angle was right. I did not pull it yet or changed out of sketch mode. I couldn't find any information on that topic, and I don't think that there was no other way then to "get it right the first time or spend hours trial and error". Any help would be appreciated.