Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 31
Fig. 41. … length, it is an equilateral triangle (Fig. 43). If one of the angles is a rightangle, it is a right-angled triangle (Fig. 44), and if no two of the sides are ofequal length, and not one of ^e angles a right angle, it is a scalene triangle. To construct an isosceles triangle (Fig. 42). Draw any…
Mechanical drawing
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