Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 30
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… … Fig. 40. as radii, describe circles dividing the first circle into three parts. Problem 5.— To draiu a straight line equal to any given arc of acircle. Let AB (Fig. 41) be the givenarc. Find the center of the arc,O^ and complete the circle ABC.Draw the diameter BOD^ and pro-duce it to J/, making DM…
Mechanical drawing
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