A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 77
nning at some point, as O,lay off OA = a, AB = i, EC = c, CD = d,DE = e, EF =/, and FG = g. It is foundin this case that the sum of these meas-ures is two circumferences and a half.Now, one circumference is the measureof 4 right angles. Hence, 2^ circumfer-ences measure 2^ x 4 r= 10 right… … ^121, Troh. lar polygon. To draw a regu- Fig. 98. as the pol5gon has sides.of the polygon. Solution.—Draw a circle, and divide the circumference into as many equal arcs The chords of these arcs will constitute the perimeter OF POLYGONS. 67 The practical difficulty lies in dividing the circumference…
Geometry · Trigonometry
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