Sine

(noun.) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle.

手打:利蒂希娅

• In all typewriters accurate location of the impression is essential to proper alignment of the letters, and proper alignment is the _sine qua non_ of typewriting. Edward W. Byrn. 十九世纪发明进展.
• A second developed a trigonometry of sines to replace the Ptolemaic trigonometry of chords. 李贝. 西洋科学史.

手打:丽塔