KTLAdesign

I am trying to find help in creating property line 6ft high cmu block walls on property lines that are a specific degree angle. Each time I try to add a line the default is an angle that has a pre determined angle set linek 5 degrees, 90 degrees, etc. I cant find the option to designate a specific angle. I am also trying to build 4 inch outdoor concrete slabs that are non rectilinear or irregular shapes. Appreciate your help. Thank you.