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Horizontal, Vertical, Depth
The term parallelogram refers to a four sided geometrical figure (in other words, a quadrilateral) in which there are two sets of parallel sides. The angles can vary; they can be right angles, or they can be acute or obtuse angles, as long as there are two sets of parallel sides. Angles are not said to be vertical to each other. Angles can be perpendicular to each other, but not vertical or horizontal. If angles are perpendicular, then they are right angles, in other words, 90o angles. Lines can be vertical, but angles can't.
The x-axis in coordinate geometry is the horizontal axis and the y-axis is the vertical axis.
No vertical angles are across from each other & adjacent angles are beside but opposite from each other.
When two angles are opposite each other. For example in an "X" the two side openings are vertical and the bottom and top angles are vertical