Perpendicular Lines With Horizontal and Vertical Labeled

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Illustration of perpendicular lines with the horizontal and vertical lines labeled. “A horizontal line is a line parallel to the horizon, or water level. A vertical line is a line perpendicular to a horizontal line; consequently, it has the direction of a plumb-line.”




International Correspondence Schools I.C.S. Reference Library Mathematics (Scranton: International Textbook Company, 1905) Geometry & Trigonometry Pg. 2


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