Measuring Angles in Isometric Planes
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The illustration showing angles of 15, 30, and 45 degrees at angles 45 and 30 degrees. Measurement of angles is created by drawing at point E at 45 or 30 degrees, then draw a straight line from E to estimate the desired angle.
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Anthony, Gardner C. Elements of Mechanical Drawing (Boston, MA: D. C. Heath & Co., 1904)
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