Construction Of A Perpendicular
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An illustration showing the construction used to erect a perpendicular at the end of a line. “With the point D as a center at a distance from the line, and with AD as radius, draw the dotted circle arc so that it cuts the line at E through E and D, draw the diameter EC: then join C and A, which will be the required perpendicular.”
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Geometric ConstructionsSource
Albert A. Hopkins Scientific America: Handy Book Of Facts And Formulas (New York: Munn & Co., Inc., 1918) 35
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