Elementary Geometrical Drawing: Part I. Including Practical Plane Geometry; the Construction of Scales; the Use of the Sector, the Marquois Scales, and the Protractor. Designed for the Use of Students Preparing for the Military Examinations, Part 1

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Longman, Green, Longman, and Roberts, 1861 - Geometrical drawing - 42 pages
 

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Page 13 - PROBLEM. From two given points on the same side of a straight line given in position, draw two straight lines which shall meet in that line, and make equal angles with it ; also prove, that the sum of these two lines is less than the sum of any other two lines drawn to any other point in the line. Analysis. Let A, B be the two given points, and CD the given line. Suppose G the required point in the line, such that AG and BG being joined, the angle...
Page 18 - To describe a parallelogram equal to a given triangle, and having an angle equal to a given angle.
Page 8 - Upon a given straight line to describe a segment of a circle, which shall contain an angle equal to a given rectilineal angle.
Page 24 - Tojind a fourth proportional to three given straight lines. Let A, B, C be the three given straight lines. It is required to find a fourth proportional to A, B, C. Take two straight lines DE, DF, containing any angle EDF: and upon these make DG equal to A, GE equal to B, and DH equal to C

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