An abscissa is the distance of a point from the vertical axis. In the standard 2-dimensional Cartesian plane, it is the x coordinate.
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The word abscissa can either refer the horizontal axis (the x-axis) in a cartesian coordinate system or the actual coordinate plotted on the horizontal axis.
The abscissa is the independent variable (or input) to a function.
The abscissa is the X coordinate of a point, so a point on the Y axis has an abscissa of zero.
It is the abscissa. The x-coordinate usually represents the location to the right of a fixed point, measured towards the right.
abscissa = sqrt[1 - square of the ordinate]