Question

What happens to a horizontal line if you rotate it 90°?

Answer 1

Answer:

it turns into a vertical line

Step-by-step explanation:

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Answer 2

Answer:

The result will be a vertical line.

Step-by-step explanation:

For any horizontal line $y=n$ for some constant $n$, any vertical line $y=a$ for some constant $a$ is perpendicular ($\vec{x} \perp \vec{y}$). Therefore, any horizontal line rotated $90^{\circ}$ in any direction will become a vertical line.