A textbook on mechanical and electrical engineering (1898)
International Correspondence Schools · Scranton : International Textbook Co., [1898-99] · leaf 317
SYMMETRICAI. AND Sl.MILAR FIGURES. 1 8(). An axis of symmetry is any line so drawn that, if the part of the figure on one side ofthe line be folded on this line, it willcoincide exactly with the other part,point for point and line for line. Thus,in Fig. 104, if the upper half be foldedover on the… … GEOMETRY AND TRIGONOMETRY. 296/^ It is evident from the above that a cirele may liave anynumber of axes of symmetry. In eertain cases, however, afigure may be symmetrical with regard to only one axis.Thus, the isosceles triangle A B C, Fig. 105,is symmetrical with regard to the axis B D,because the…
Electrical engineering · Mechanical engineering
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