Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 33
FiG. 49. Fig. 50. gles equal. This figure is called a parallelogram^ and the line C B, extend-ing between opposite angles, is a diagonal. On the hypothenuse of a right-angled triangle (Fig. 51) construct anotherequal to it, and the exterior lines form a parallelogram, which, as all the anglesare…
Mechanical drawing
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