how to create a plane at an angle to a any unknown plane.
there are two way to create a plane at an angle to other plane. you can draw 2 lines with using 3d sketch and you give an angle one of lines, then referans geometry>>plane. or you can follow this tutorial to create a angled plane whitout draw 2 lines
draw a line
the marked button will be passive. don' t think that it can not be in use, click on
enter a degree and that's all:)) very simple