Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 30
Fig. 38. Problem 3. — To divide a circle into three concentric parts bearing theproportions of i, 2, T) f^om the center. Let ABC (Fig. 39) be the given circle. Mark the center Z>, and GEOMETRIC PROBLEMS. 25 draw AD^ and in this radius describe a semi-circle. Divide the radius AD into six… … Problem 4. — To divide a circle into any number of equal or propor-tional parts by conccfitric divisio7ts. Let ABC (Fig. 40) be the circle to be dividedinto three parts. Draw the radius AD^ anddivide it into as many equal parts as the circleis to be divided into. Upon the radius describea…
Mechanical drawing
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