Elements of geometry : containing books I to VI and portions of books XI and XII of Euclid, with exercises and notes (1881)
Smith, J. Hamblin (James Hamblin), 1829-1901, Kirkland, Thomas, 1835-1898 · Toronto : W.J. Gage · leaf 187
bedand circumscribed circles have a common centre. IV. If the circumference of a circle be divided into anynumber of equal parts, the chords joining each pair of consecu-tive points form a regular figure inscribed in the circle, and thetangents drawn through the points form a regular figure… … Let ABC be the given 0, and D the given line, not greaterthan the diameter of the 0. Jt is required to draw in the 0 ABC a chord = D. Draw EC, a diameter of 0 ABC. Then if EC=D, what was required is done. But if not, EC is greater than D. From EC cut off EF=D,and with centre E and radius EF…
Geometry · Geometry, Plane
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