Triangles - 14276

Illustrator Draftsman 3 & 2 - Volume 2 Standard Practices and Theory
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Polygonal Construction, Continued Triangles The preferred method of drawing triangles is with triangles or a protractor. To draw triangles using triangles, use this table: Step Action 1 Select a triangle that contains the angles required to draw the triangle. For example, select a 30/60/90° triangle to draw an equilateral triangle where each angle equals 60°. 2 Draw a perpendicular line to the center of AB. 2 With given horizontal line AB, place the triangle base edge against the straightedge of your drafting table with the 60° angle at A. 3 Draw line AC to the perpendicular line. 4 Flip the triangle over to place the 60° angle at the base of the triangle at B and against the straightedge of your table. 5 Draw line BC. Lines AC and BC should intersect above the center of line AB and form a 60° angle to complete the equilateral triangle. Figure 2-37 shows the construction of an equilateral triangle using a 30°/60°/90° triangle. Figure 2-37.—Constructing an equilateral triangle. Continued on next page 2-38

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