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see trigonometrytrigonometry
[Gr.,=measurement of triangles], a specialized area of geometry concerned with the properties of and relations among the parts of a triangle. Spherical trigonometry is concerned with the study of triangles on the surface of a sphere rather than in the plane; it is
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of an angle
a trigonometric function that in a right-angled triangle is the ratio of the length of the adjacent side to that of the hypotenuse; the sine of the complement
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In a right triangle, the ratio of the side opposite an acute angle (less than 90 degrees) and the hypotenuse. The cosine is the ratio between the adjacent side and the hypotenuse. These angular functions are used to compute circular movements.
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References in periodicals archive ?
According to 1945 articles published in the Birmingham Evening Despatch, which merged with the Mail in the late 1960s, 30-year-old Sgt Moore, of C Squadron, 10th Royal Hussars, had crossed the River Cosina in Italy.
La zia ti ha portato una cosina!", e tirava fuori dalla borsa un regalino, mentre di soppiatto rimetteva dentro la borsa il fazzoletto ricamato, sperando che Egidio non l'avesse vista piangere.
Some Ricoh, Vivitar, and Phoenix cameras also belong to this family; all of them are actually made by Cosina.
The main narrative, however, is set in the 1990s, and takes place mostly in the Black Images bookstore, owned by Cosina Brown--Miss Cozy.
She has dropped Fergie, Lady Cosina Somerset and Catherine Soames because they don't fit in with the serious career-girl image she is trying to cultivate.