Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 68
Th. xix), and the arc DBE to onehundred and twenty degrees; hence, the angle DAE is equalto sixty degrees (Bk. II. Th. viii). Again, since the arc BD is equal to sixty degrees, and thearc BDA equal to one hundred and eighty degrees, it followsthat DA will be equal to one hundred and twenty… … PROBLEM XXI.To inscribe a regular hexagon in a circle. Draw any radius, as AC. Then ap-ply the radius AC around the circum-ference, and it will give the chords AD,DE, EF, FG, GH, and HA, which willbe the sides of the regular hexagon. For,the side of a hexagon is equal to the radius (Bk. II. Th.…
Geometry · Plane trigonometry
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