a. Geom. [f. EQUI- + ANGULAR.] Having equal angles.

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  a.  Having all its angles equal. b. Having angles respectively equal with those of another figure, or making equal angles with a line. Equiangular spiral (see quot. 1884).

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1660.  Barrow, Euclid, I. def. 28 b. An Equiangular or equal-angled figure is that whereof all the angles are equal.

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1721–1800.  in Bailey.

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1756.  Simpson, Euclid, 134 (Jod.). A circle may be inscribed in a given equilateral and equiangular quindecagon.

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1786.  Phil. Trans., LXXVI. 21. The method employed to make the threads of the screw equiangular with the axis.

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1840.  Lardner, Geom., 119. Mutually equiangular, and … therefore similar.

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1854.  Woodward, Mollusca, II. 223. Beak prominent, area equiangular.

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1884.  B. Williamson, Diff. Calculus, xii. 223. In the logarithmic spiral … the angle between the radius vector and the tangent is constant. On account of this property the curve is also called the equiangular spiral.

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