Two of the principal faces and axes are equally inclined to the plane of projection. Dimetrics have only two axes at the same scale and same angle to the picture plane. The vertical dimension is foreshortened. When the axes of the base are set at right angles, the drawing in essence begins with a plan view. A Dimetric projection is created using 3 axes but only two of these have equal angles. The smaller these angles are the less we see of the top surface. The angle is usually around 105°. In dimetric pictorials, the direction of viewing is such that two of the three axes of space appear equally foreshortened, of which the attendant scale and angles of presentation are determined according to the angle of viewing; the scale of the third direction (vertical) is determined separately. Approximations are common in dimetric drawings.
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