Abscissa n. : One of the elements of reference by which a point, as of a curve, is referred to a system of fixed rectilineal coordinate axes.

Example:
a radius vector in quadrant II has length of 6 and an Abscissa of 2.25.What is the angle of dir in radian msr?

Taxonomy
abscissa, free encyclopedia, search, ordered pair, Cartesian coordinate, free dictionary, element, rectilinear, axes, Personal tools, Interaction, Toolbox, Languages, non-profit organization, Geometry, mathematics, Elementary mathematics, Mathematics terms.

Defination from the web:
Abscissa. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Look up abscissa in Wiktionary, the free dictionary. In mathematics, abscissa (plural abscissae) refers to the first element of an ordered pair. ...