Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 43
s into which it ■ wasdivided. In the figure the parallel lines are drawn across the sides of the triangles atone half their length, and the areas of the small triangles are therefore equal tothe square of one half or to one quarter that of the original triangles; conse-quently the area of the… … lay off a line and divide from 0 by equal units to 6; at 6, with a radius equalto 6 on scale (i inch), describe an arc, and from 0 with a scale of f inch, witha radius equal to 6, intersect the previous arc. Complete the triangle throughthis intersection, and draw lines parallel to 6, 6 through the…
Mechanical drawing
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