The line at an angle of 45 ° can be easily marked on the board or plate to be cut without the use of specialized scribing tools. It is enough to fold a square piece of paper diagonally. However, let's do it as precisely as possible. The longer side of the so-obtained triangle, the so-called. place the hypotenuse evenly against the edge of the board. The shorter sides then form angles with it – 45° i 135°. Along these sides, we outline the lines with an ordinary carpenter's pencil.