Microsoft Word - lecnote_fm_engineering drawing

Figure 5.19 Isometric Projection

In the figure above, the projections of the axes OX, OY and
OZ make angles of 120^0 with each other, and are called the
isometric axes. Any line parallel to one of these is called an
Isometric line; a line which is not parallel is called a non-
isometric line. It should be noted that the angles in the
isometric projection of the cube are either 120^0 or 60^0 and that
all projections of 90^0 angles. In an isometric projection of a
cube, the faces of the cube or any planes parallel to them are
called Isometric planes.