Wallis, Rolland S. [from old catalog], Iowa state college of agriculture and mechanic arts, Ames. Dept. of engineering extension. [from old catalog] · Ames, Iowa, Engineering extension department, Iowa state college · leaf 62
Pentagon Hexagon Heptagon (c) Regular Polygons … Octagon Fig. 80.—Triangles, quadrilaterals and polygons. —Any plane figure having four straight sides is calledThe common sorts of quadrilaterals are shown in Quadrilaterals.-a quadrilateral.Fig. 80b. Polygons.—The equilateral triangle and the square are regular poly-gons. Other regular polygons…
Mechanical drawing
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