# tangents

Noun

- plural form of
*tangent*

- In another question connected with this, the problem of drawing
**tangents**to any curve, Descartes was drawn into a controversy with Pierre (de) Fermat (1601-1663), Gilles Persone de Roberval (1602-1675), and Girard Desargues (1593-1661). - In projective geometry it may be defined as the conic which intersects the line at infinity in two real points, or to which it is possible to draw two real
**tangents**from the centre. - The rules then are sine of the middle part = product of
**tangents**of adjacent parts = product of cosines of opposite parts. - With increase of speeds this matter has become important as an element of comfort in passenger traffic. As a first approximation, the centre-line of a railway may be plotted out as a number of portions of circles, with intervening straight
**tangents**connecting them, when the abruptness of the changes of direction will depend on the radii of the circular portions. - These semicircles and the circles A'A' are joined by
**tangents**and short arcs struck from the centre of the figure.

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- tangents
- tangerang
- tangeraxanthin
- tangerine

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