Lines perpendicular to each other may be drawn by using a triangle in combination with the T-square.…

Perpendicular lines are drawn by fitting the hypothenuse of the triangle to the T-square at an angle,…

Illustration of perpendicular lines. Intersecting lines that meet at a right angle.

Illustration of perpendicular lines with the horizontal and vertical lines labeled. "A horizontal line…

Drawing perpendicular lines using a drawing board and pairs of triangles.