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The Decorator's assistant (1847)
[London : W. Gibbs] · leaf 139
centres and circumferences of regular poly-gons, from three to twelve sides inclusive. Names, Sides. Angles atthe Centre. Angles at theCircumference. deg. min. deg. min. Trigon 3 120 0 60 0 Tetragon ... 4 90 0 90 0 Pentagon... 5 72 0 108 0 Hexagon... 6 60 0 120 0 Heptagon 7 51 25 5-7 128 34 2-7… … THE DECORATOR S ASSISTANT. 127Design · Decoration and ornament · Art
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