American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 65
bout a given circle to describe a triangle similar to agiven triangle ABC. Draw a circle. Find its centre, and draw any radius as 1 2 ; pro-duce the base of the given triangle to 3 and 4, and at point 1 makethe angle 2 16, equal to the external angle A B 3 ; also the angle 215,on the other side of… … Prob. 63.—To inscribe a regular heptagon within a given circle. Draw a circle, and any radius, as 1 2. With centre 1, radius 1 2,cut the circle in 3 and 4. Draw 3 4 intersecting 1 2 in 5. Then 3 5will be the side of the required heptagon, which side is to be markedround the circle in points A, B,…
Geometrical drawing
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