Easel shapes

When making a shape is there anyway to set how long a line is or what angle something is? I’m trying to make a cut out so another piece of wood can fit in. I want a certain angle and distance so i know the wood can fit. Any help?

Can you add points in after you’ve already made a shape?

Select the pen drawing tool, draw a vertical or horizontal line, then from the editing box, select Shape, then specify the length or width, then the angle. Then just move the line where you want it.