Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 43
Fig 85. each other (Fig. 86) are similar. A line c drawn parallel to one side c of atriangle (Fig. 87) forms a triangle a c b whose sides are proportional to theoriginal triangle. In Fig. 88 a polygon is divided into trian-gles by lines from an interiorpoint to its angles and these lines…
Mechanical drawing
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