Babbit, Arthur B · New York, H. Holt and company · leaf 204
To construct an angle of 6odegrees—Let A B be oneof the sides. With A as acenter and any radius, drawarc 1, cutting A B at C.With C as a center andthe same radius, draw arc2 cutting arc 1 at D. Line^ A D will make an angle of60 degrees with A B. GEOMETRICAL PROBLEMS 193
Mechanical drawing
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