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The angle formed by a horizontal line is 180o.
Angles are formed by the intersection of two planes.
No, horizontal planes run parallel to each other, so they do not intersect, but two vertical planes can intersect. Imagine the pages of a books as several planes. When you stand the book up, they are all vertical, but they all intersect at the book spine.
ONLY a line can be formed by the intersection of two planes...and always.
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