Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 60
em 40. On a given line AB, to describe a regular polygon.For example, a heptagon. Produce AB to C. With A as centre, and AB as radius, describe a semicircle, and divide itinto as many equal divisions asthere are sides to the polygon (inthis instance seven). Join A withthe second division from C… … ^ The line AD is always drawn to the second division from C, whatevernumber of sides the polygon may contain. 40 PRACTICAL PLANE GEOMETRY
Geometrical drawing
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