a figure having nine sides and angles. In a regular nonagon, or that whose angles and sides are all equal, if each side be 1, its area will be

\[ \frac{6}{\sqrt{3}} = \frac{6}{\sqrt{3}} \text{ of the tangent of } 75^\circ, \text{ to the radius } 1. \]

NON, Cape, a promontory on the west coast of Africa, opposite to the Canary islands. W. Long. 12°. N. Lat. 44°. 28'.