American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 56
Prob. 47.— Within any sector of a circle, to inscribe a circle.Draw any sector, as A B C. Bisect the angle at C and continuethe bisecting line until it cuts the arc A B at D. At D erect aperpendicular to D C. Produce C B to cut this perpendicular in E. Bisect angle DEC, producing the bisecting line… … Prob. 48.— Within a given pentagon A B C D E, to inscribe anequilateral triangle. Construct the pentagon. Draw a diagonal E C, and a line 1 2through D parallel to E C. With D as centre describe a semicircleon the line 1 2, cutting it in points 1 and 2. With 1 and 2 as cen-tres and with the radius…
Geometrical drawing
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