There are 45°, 90°, 30°, 60° and 90° square edges on the triangle plate. Use a triangular board and a T-square to draw a series of vertical lines in a bottom-up order. Use a T-square and a set square to draw straight lines of 30°, 45°, and 60°. When drawing, draw diagonal lines from left to right. Use two triangles and a T-square to draw oblique lines of 15°, 75°, and 105°. Using two triangular plates together, you can draw parallel lines to any drawing line.
Triangle ruler simple strokes picture
