Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 33
lelogram in which all the sides are equal, but the angles not rightangles, is called a rliomhus (Fig. 52) ; if only the opposite sides are equal, it is Fig. 51. Fig. 52. called a rliomloid (Fig. 50); if only two sides are parallel, the figure is a trape-zoid (Fig. 53). Take any figure (Fig. 54)… … Fig. 53. Fig. 54. angles as sides less the four right angles at the centre, the sum of the anglesof any triangle being equal to two right angles. If a line be drawn from the CONSTRUCTION OF GEOMETRICAL PROBLEMS. 17 interior point to one side, another triangle is added to the collection and tworight…
Mechanical drawing
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