Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 34
uired. When the triangle is equilateral, the centreof the circle is more easily found by bisectingtwo of the sides, and drawing perpendiculars.Or, draw a perpendicular from one of the sidesto the opposite angle, and from the side set offone third of the length of the perpendicular. To inscribe a… … Fig. 59.
Mechanical drawing
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