A perpendicular dropped from a point to the $x$-axis has length equal to the:

A perpendicular dropped from a point to the $x$-axis has length equal to the:
  1. Abscissa of the point
  2. Absolute value of the ordinate
  3. Sum of the coordinates
  4. Distance from the origin

Solution

The perpendicular from $(x,y)$ to the $x$-axis has length $|y|$, the absolute value of the ordinate.

Asked in: IMO

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