Analytical space geometry

2010005006

Level: 
B
Find the angle between the line \(q\) and the plane \(\sigma \). \[ \sigma \colon 2x-z+4 = 0;\qquad \qquad \begin{aligned}[t] q\colon x& = 5r, & \\y & = -3+2r, \\z & = -2;\ r\in \mathbb{R} \\ \end{aligned} \] Round your answer to the nearest minute.
\(56^{\circ }09'\)
\(56^{\circ }08'\)
\(33^{\circ }51'\)
\(33^{\circ }52'\)

2010005005

Level: 
B
Given points \(C = [-2;3;-1]\), \(D= [1;2;-3]\), find the angle between the line \(CD\) and the line \(p\). \[ \begin{aligned}p\colon x& = 2 -s, & \\y & = 3, \\z & = 2s;\ s\in \mathbb{R} \\ \end{aligned} \] Round your answer to the nearest minute.
\(33^{\circ }13'\)
\(56^{\circ }47'\)
\(90^{\circ }\)
\(146^{\circ }47'\)

2010005003

Level: 
A
Find all the values of the real parameter \(p\) so that the lines \(a\) and \(b\) are skew lines. \[ \begin{aligned}a\colon x& =- 1 + 2m, & \\y & = 1 - pm, \\z & = 2 - m;\ m\in \mathbb{R} \\ \end{aligned}\qquad \qquad \begin{aligned}b\colon x& = 3+2n, & \\y & = 1-n, \\z & = 5+4n;\ n\in \mathbb{R} \\ \end{aligned} \]
\(p\in\mathbb{R}\setminus\{-1\}\)
\(p = -1\)
No solution exists.
The lines are skew for every real \(p\).

2010005002

Level: 
A
Find the intersection of the line \(KL\) and the line \(q\), where \(K = [1;3;5]\), \(L = [3;-2;4]\) and \[ \begin{aligned}q\colon x& = 1 + r, & \\y & = 5 - 2r, \\z & = 3 - r;\ r\in \mathbb{R}. \\ \end{aligned} \]
\([-3;13;7]\)
\([5;-7;3]\)
\([5;-3;-1]\)
There is no intersection.

2010005001

Level: 
A
Determine whether two lines $a$ and $b$ are identical, parallel, intersecting or skew. \[\begin{aligned} a\colon x & = 3 -2m, & & \\y & = 4 - 3m, & & \\z & = 4+m;\ m\in \mathbb{R} & & \end{aligned}\] \[\begin{aligned} b\colon x & = - n, & & \\y & = -5, & & \\z & = 4-3n;\ n\in \mathbb{R} & & \end{aligned}\]
skew lines
identical lines
intersecting lines
parallel lines, not identical

1003233607

Level: 
C
Determine the relative position of three planes: \begin{align*} \alpha\colon\ &2x+y+9z-18=0, \\ \beta\colon\ &x+3y+2z+16=0, \\ \gamma\colon\ &x+2y+3z+6=0. \end{align*}
Planes $\alpha$, $\beta$ and $\gamma$ intersect in a straight line.
Each of the two planes are intersecting and the lines of intersection are three different lines parallel to each other.
All three planes intersect at just one point.

1003233605

Level: 
C
We are given skew lines $p$ and $q$. \begin{align*} p\colon x&= 1-t, & q\colon x&= 1-2s, \\ y&= 1+t, & y&=s, \\ z&= 3+2t;\ t\in\mathbb{R}, & z&= 3+3s;\ s\in\mathbb{R}. \end{align*} Find parametric equations of a straight line $r$, that is intersecting both lines $p$ and $q$ and lying in the plane $x+2y-z+2=0$.
$\begin{aligned} r\colon x&=-1+2m, \\ y&=3-3m, \\ z&=7-4m;\ m\in\mathbb{R} \end{aligned}$
$\begin{aligned} r\colon x&=-1+m, \\ y&=3+3m, \\ z&=7-m;\ m\in\mathbb{R} \end{aligned}$
$\begin{aligned} r\colon x&=-1+3m, \\ y&=3+2m, \\ z&=7+5m;\ m\in\mathbb{R} \end{aligned}$
$\begin{aligned} r\colon x&=-1+m, \\ y&=3-m, \\ z&=7+m;\ m\in\mathbb{R} \end{aligned}$