Boyd Ingram
12/11/2023 · Elementary School
Esencrio 12.2 Stabilire se i punti \( A, B, C \in A^{3}(\mathbb{R}) \) sono allineati. In caso altermativo, determinare la retta che passa per ensi, in caso negativo il piano che li oontiene: (h) \( A=(3,0,-2) \quad B=(4,-1,-4) \quad C=(2,1,0) \); (ii) \( A=(2,2,2) \quad B=(1,1,-1) \quad C=(-1,2,3) \);
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### (h) Punti \( A=(3,0,-2) \), \( B=(4,-1,-4) \), \( C=(2,1,0) \)
- **Verifica allineamento:** I punti sono **allineati**.
- **Equazione della retta:**
\[
\begin{cases}
x = 3 + t \\
y = 0 - t \\
z = -2 - 2t
\end{cases}
\]
o in forma vettoriale:
\[
\vec{r}(t) = (3, 0, -2) + t \cdot (1, -1, -2)
\]
o in forma simmetrica:
\[
\frac{x - 3}{1} = \frac{y}{-1} = \frac{z + 2}{-2}
\]
---
### (ii) Punti \( A=(2,2,2) \), \( B=(1,1,-1) \), \( C=(-1,2,3) \)
- **Verifica allineamento:** I punti **non sono allineati**.
- **Equazione del piano:**
\[
x - 10y + 3z = -12
\]
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