Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 41
B … Fig. 81. Fig. 82. were but five divisions in the base and five in the perpendicular, the surfacewould be twenty-five squares. Therefore, a rectangle has for its measure thebase multiplied by its adjacent side or height. Draw a diagonal, and the rectangle is divided into two equal triangles.Each…
Mechanical drawing
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