A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 28
al triangle. Construction :Assume any length for a base. With a radius equal tothe length of base and each terminal C and D as cen-ters describe intersection at X. Connect this point bylines to C and D. Measure the angles of an equilateraltriangle in degrees. What is their sum ?… … Fig. 14 greater or smaller than AB proceed as in the problemabove. Are all the angles equal? What is their sum?Fig. 15. Exercise 14.—The vertex angle of an isosceles tri-angle is 150°, and its base is 3 inches long. Withoutprotractor make a drawing. The trilium is an early
Mechanical drawing
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