Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 24
Fig. 28. … Fig. 29. Problem 9. — To trisect any^angle. Let ABC (Fig. 29) be the angle. From^ as a center, describe an arc EF. Withthe same radius, and i^ as a center, describean arc cutting the arc EF in O. From E asa center, and the same radius, describe anarc, and locate the point S. Through thepoints O and…
Mechanical drawing
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