trigonometryn.

/trɪɡəˈnɒmɪtri/

Etymology: < modern Latin trigōnometria (B. Pitiscus, German mathematician, 1595), < Greek τρίγωνον triangle + -μετρία -metry comb. form. So French trigonométrie (1613).

That branch of mathematics which deals with the measurement of the sides and angles of triangles, particularly with certain functions of their angles or of angles in general (the sine n.¹, cosine n., tangent adj. and n., cotangent n. and adj., secant adj. and n., and cosecant n.), and hence with these functions as applied to abstract quantities; thus including the theory of triangles, of angles, and of (elementary) singly periodic functions. Trigonometry comprises plane trigonometry, which treats of plane triangles and angles, and spherical trigonometry, which treats of spherical ones, i.e. those described on the surface of a sphere.

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the world > relative properties > number > geometry > [noun] > branches of > trigonometry

trigonometry1614

right-angled trigonometry?a1729

1595 B. Pitiscus (title) Trigonometria: sive De Solvtione Triangvlorvm Tractatus breuis & perspicuus.]

1614 (title) Trigonometry: or The Doctrine of Triangles. First written in Latine, by B. Pitiscus.., and now Translated into English, by Ra. Handson.

1631 R. Norwood (title) Trigonometrie, or, The doctrine of triangles: divided into two bookes: the first shewing the mensuration of right lined triangles: the second of sphericall.

1738 Gentleman's Mag. Jan. 13/1 A few Calculations by Trigonometry.

1814 J. Playfair Outl. Nat. Philos. II. i. i. 13 It often happens..that the stars must be observed when they are not on the meridian, and their positions..must then be derived from spherical trigonometry.

1854 C. Kingsley Alexandria i. 31 For the purpose of working out this theory he [Hipparchus] required a science of trigonometry plane and spherical: and this he accordingly seems to have invented.

This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2018).

单词	trigonometry
释义	trigonometryn. /trɪɡəˈnɒmɪtri/ Etymology: < modern Latin trigōnometria (B. Pitiscus, German mathematician, 1595), < Greek τρίγωνον triangle + -μετρία -metry comb. form. So French trigonométrie (1613). That branch of mathematics which deals with the measurement of the sides and angles of triangles, particularly with certain functions of their angles or of angles in general (the sine n.¹, cosine n., tangent adj. and n., cotangent n. and adj., secant adj. and n., and cosecant n.), and hence with these functions as applied to abstract quantities; thus including the theory of triangles, of angles, and of (elementary) singly periodic functions. Trigonometry comprises plane trigonometry, which treats of plane triangles and angles, and spherical trigonometry, which treats of spherical ones, i.e. those described on the surface of a sphere. ΘΚΠ the world > relative properties > number > geometry > [noun] > branches of > trigonometry trigonometry1614 right-angled trigonometry?a1729 1595 B. Pitiscus (title) Trigonometria: sive De Solvtione Triangvlorvm Tractatus breuis & perspicuus.] 1614 (title) Trigonometry: or The Doctrine of Triangles. First written in Latine, by B. Pitiscus.., and now Translated into English, by Ra. Handson. 1631 R. Norwood (title) Trigonometrie, or, The doctrine of triangles: divided into two bookes: the first shewing the mensuration of right lined triangles: the second of sphericall. 1738 Gentleman's Mag. Jan. 13/1 A few Calculations by Trigonometry. 1814 J. Playfair Outl. Nat. Philos. II. i. i. 13 It often happens..that the stars must be observed when they are not on the meridian, and their positions..must then be derived from spherical trigonometry. 1854 C. Kingsley Alexandria i. 31 For the purpose of working out this theory he [Hipparchus] required a science of trigonometry plane and spherical: and this he accordingly seems to have invented. This entry has not yet been fully updated (first published 1914; most recently modified version published online September 2018). < n.1614
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