Skip to main content\(\newcommand{\R}{\mathbb{R}}
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A plot of three parallel planes in three dimensions are all drawn in green. These planes increase in the z-coordinate when either x or y are decreased. A red vector goes from the middle of each plane and is perpendicular to the given plane. The red vector is labeled
\(\langle 1,2,1 \rangle \) for two of these planes. The third plane has a red vector with twice the length and in the opposite direction of the others and is labeled
\(\langle -2,-4,-2\text{.}\)