Triangles-Cont. - 14276

Illustrator Draftsman 3 & 2 - Volume 2 Standard Practices and Theory
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Polygonal Construction, Continued Triangles (Continued) You may also use a protractor to construct triangles. To use a protractor or semicircular protractor to construct an equilateral triangle, use this table: Step Action 1 With a straightedge, draw a line (AB) at any convenient length and a perpendicular line at the center. 2 Place the center of the protractor (usually marked 0) at A, align the protractor with the line AB. 3 Locate the 60° increment on the protractor and lightly mark your paper. If using a full circular protractor, you can increase accuracy by also locating and marking the opposing angle. This allows you to use the four-point reference system (DM Volume 1, chapter 2). 4 Move the protractor to B on line AB. Locate and mark the drawing at the 60º increment. Also mark the opposing angle , if possible. 5 Draw straight lines through the marked increments terminating at the perpendicular line. These lines should intersect forming an equilateral triangle. Figure 2-38 shows an equilateral triangle constructed by using a protractor. Figure 2-38.—Constructing an equilateral triangle with a protractor. Continued on next page 2-39

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