Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 16
Rhombus. Trapezoid.Fig. 12.—Quadrilaterals. Trapezium. DEFINITIONS, II 26. An equilateral polygon is one whose sides are equal. 27. An equiangular polygon is one whose angles are equal. TRIANGLES.
Mechanical drawing
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