CONSTRUCTING ANGLES & SHAPES
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We use the standard draftingtriangles to
construct 30·. 45·. 60·. and 90•angles. Usingboth
45°-45° and 30·-60° triangles in combination, we
can also easily construct 15°and 75o angles. For
other angles, use a protractor or anadjustable
triangle.
The diagramsto the left illustrate how to construct
three common geometric shapes.
Digital Drawing
In digital drawing, we create lines and shapes by
designating geometric coordinates or specifying a
combination of location, direction, and distance.
Snap-to commands, grids, guidelines, and symbol
libraries further aid the drawing of electronic lines
and shapes.
ARCHITECTURAL DRAFTING/ 21