Polygonal Construction, ContinuedTrianglesThe preferred method of drawing triangles is with triangles or a protractor.To draw triangles using triangles, use this table:StepAction1Select a triangle that contains the angles required to draw thetriangle. For example, select a 30/60/90° triangle to draw anequilateral triangle where each angle equals 60°.2Draw a perpendicular line to the center of AB.2With given horizontal line AB, place the triangle base edge againstthe straightedge of your drafting table with the 60° angle at A.3Draw line AC to the perpendicular line.4Flip the triangle over to place the 60° angle at the base of thetriangle at B and against the straightedge of your table.5Draw line BC. Lines AC and BC should intersect above the centerof line AB and form a 60° angle to complete the equilateral triangle.Figure 2-37 shows the construction of an equilateral triangle using a30°/60°/90° triangle.Figure 2-37.—Constructing an equilateral triangle.Continued on next page2-38

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