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polimi-cheatsheet
GitHub Repository: polimi-cheatsheet/GAL-cheatsheet
Path: blob/master/esercizi/1.piano-perp-retta-per-1-punto.tex
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\subsection{Piano $\pi \perp r$ passante per $C(1, 1, 2)$}
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$\vec{n} = \vec{d}_r = (-2, 1, 2)$
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$\pi: -2x + y +2z + d = 0$, imponendo il passaggio per $C$:
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$-2 + 1 + 4 + d = 0 \Rightarrow d = -3$
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