Question
A horizontal line and a vertical line always intersect at right angles.
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Answer
Lines that never slant up or down are called horizontal lines.
Lines that go straight up and down are called vertical lines.
Let $AS$ be a horizontal line and $CD$ be a vertical line, which intersect at $0.$
Clearly, $\angle\text{AOD}, \angle\text{AOC},\angle\text{COB}$ and $\angle\text{BOD}$ are right angles.
Lines that go straight up and down are called vertical lines.
Let $AS$ be a horizontal line and $CD$ be a vertical line, which intersect at $0.$
Clearly, $\angle\text{AOD}, \angle\text{AOC},\angle\text{COB}$ and $\angle\text{BOD}$ are right angles.
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