Foundation
The dihedral system is a method of representation of multiple projections, where the elements are defined by their orthogonal projections on at least two planes of projection. projection planes that we use are generally 3: plan, elevation and profile . Once they have been projected onto each of them the orthogonal views of the object are rotated until they match the three in the same plane. Figure cylinder projecting a point by point on the horizontal plane and the vertical PH PV. As is done by perpendicular, the circumference of the base becomes the elevation in a straight line, as the plane that contains perpendicular to the vertical. For be parallel to the floor, the upper face of the cylinder on this plane is transformed Like a circle. The line of intersection of vertical and horizontal plane is called land line . Then turn the vertical plane 90 degrees until it coincides with the horizontal axis of rotation t...