Not necessarily. A perpendicular to a sloped line will be sloped. It will be at right angles to the sloped line, though.
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A horizontal line is a line perpendicular to the vertical.
Vertical motion is the motion that is perpendicular to the ground.
Vertical angles can be supplementary angles if the lines are perpendicular and then both of the vertical angles would be 90 digress.
No. Up-down is vertical. Horizontal is perpendicular to vertical.
It is its vertical perpendicular height