Which way is vertical up or down?

Answer 1

Vertical means up and down. A horizontal line goes from the left to the right (or from the right to the left) like this: -----------------------------

A horizontal line goes from a position that is low to a position that is high (or from a position that is high to a position that is low) like this:

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But the word "vertical" does not tell you which direction the line is drawn, just the it is a line.

Answer 2

vertical is up and down