Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 44
s at this point will alsobe 360°, and there will be asmany angles formed in the centreas there are exterior angles.In regular polygons these angles at the centre will, of course,be equal to each other ; and if we produce the sides in onedirection, as in Fig. 73, the exterior angles will be equal to… … POLYGONS. iiven line AB, for To construct any regular polygon on theexample, a nonagon, 360°-r 9=40°.So if we draw a line at B,making an angle of 40° withAB produced, it will give us the exterior angle of the nona- r gon, from which it will beeasy to complete the polygon. The perimeter of a polygon…
Geometrical drawing · Design · Drawing
Internet Archive · Wellesley College Library · Public Domain Mark 1.0. Free to use for anything.
