Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 326
Fig. 363. To Trisect a Eight Angle PROBLEM 4 Given: A ngr/i;^ angle AB C. Required: To trisect angle ABC. Fig. 363. GEOMETRICAL CONSTRUCTIONS 321 Instructions: First Method. With B as a center, draw anarc A C of any radius. With A and C as centers and the sameradius, draw arcs B D and B E. The… … Fig. 364. To Trisect a Eight Angle with the Triangle Second Method. An angle may be divided into any numberof equal parts by drawing an arc such as A C in Problems 3and 4 and stepping off equal distances on the arc, with thedividers.
Mechanical drawing
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