Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 50
, byjoining which we get therequired heptagon. Fig. 83. 46. On a given line AB, to construct a regular heptagon(approximately). With B as centre, and BA as radius, draw a semicircle meeting AB produced in C. With centre A, andradius AB, draw an arccutting the semicircle in D. Draw DE perpendi-cular… … Fig. 84. draw a circle. With AB as radius commencing at F, set offon the circle the points K, L, M, and N, by joining which weget the heptagon required. POLYGONS. 37 47. On a given line AB, to construct a regular octagon. At A and B erect the perpendiculars AC and BD. ProduceAB to E. Bisect…
Geometrical drawing · Design · Drawing
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