Analytical space geometry

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 $x+2y-z+2=0$.
$\begin{aligned} r\colon x&=-1+2m, \\ y&=3-3m, \\ z&=7-4m;\ m\in\mathbb{R} \end{aligned}$
$\begin{aligned} r\colon x&=-1+m, \\ y&=3+3m, \\ z&=7-m;\ m\in\mathbb{R} \end{aligned}$
$\begin{aligned} r\colon x&=-1+3m, \\ y&=3+2m, \\ z&=7+5m;\ m\in\mathbb{R} \end{aligned}$
$\begin{aligned} r\colon x&=-1+m, \\ y&=3-m, \\ z&=7+m;\ m\in\mathbb{R} \end{aligned}$

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.

1103212201

Level: 
C
A straight line \( p \) is given by the points \( M=[4;2;0] \) and \( N=[6;6;7] \) (see the picture). Find the parametric equations of the line \( p' \) that is symmetrical to the line \( p \) in the plane symmetry across the coordinate \( xy \)-plane.
\( \begin{aligned} p'\colon x&=4+2t, \\ y&=2+4t, \\ z&=-7t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=4+6, \\ y&=2+6t, \\ z&=-7t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=4+2t, \\ y&=2+4t, \\ z&=7t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=4+6t, \\ y&=2+6t, \\ z&=7t;\ t\in\mathbb{R} \end{aligned} \)

1103212202

Level: 
C
A straight line \( p \) is given by the points \( M=[4;3;2] \) and \( N=[0;6;7] \) (see the picture). Find the parametric equations of the line \( p' \) that is symmetrical to the line \( p \) in the plane symmetry across the coordinate \( yz \)-plane.
\( \begin{aligned} p'\colon x&=4t, \\ y&=6+3t, \\ z&=7+5t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=-4t, \\ y&=6+3t, \\ z&=7+5t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=4t, \\ y&=6-3t, \\ z&=7+5t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=-4t, \\ y&=6-3t, \\ z&=7+5t;\ t\in\mathbb{R} \end{aligned} \)

1103212203

Level: 
C
A straight line \( p \) is given by the points \( M=[4;3;2] \) and \( N=[8;0;5] \) (see the picture). Find the parametric equations of the line \( p' \) that is symmetrical to the line \( p \) in the plane symmetry across the coordinate \( xz \)-plane.
\( \begin{aligned} p'\colon x&=8+4t, \\ y&=3t, \\ z&=5+3t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=8+4t, \\ y&=0, \\ z&=5+3t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=8+4t, \\ y&=-3t, \\ z&=5+3t;\ t\in\mathbb{R} \end{aligned} \)
\( \begin{aligned} p'\colon x&=8-4t, \\ y&=3t, \\ z&=5-3t;\ t\in\mathbb{R} \end{aligned} \)

1103212204

Level: 
C
A cube \( ABCDEFGH \) with an edge length of \( 2 \) is placed in a coordinate system (see the picture). Let the point \( M \) be the centre of the edge \( EF \). Find the general form equation of the plane \( \rho \) passing through the points \( B \), \( D \), and \( G \) and calculate the distance of \( M \) from the plane \( \rho \).
\( \rho\colon x-y+z=0;\ |M\rho|=\sqrt3 \)
\( \rho\colon x-y+z+2=0;\ |M\rho|=\sqrt3 \)
\( \rho\colon x-y+z+2=0;\ |M\rho|=2\sqrt3 \)
\( \rho\colon x-y+z=0;\ |M\rho|=2\sqrt3 \)

1103212205

Level: 
C
A cube \( ABCDEFGH \) with an edge length of \( 2 \) is placed in a coordinate system (see the picture). Find the distance between parallel planes \( \alpha \) and \( \beta \), where \( \alpha \) is passing through \( B \), \( D \) and \( G \) and \( \beta \) is passing through \( A \), \( F \) and \( H \).
\( |\alpha\beta|=\frac{2\sqrt3}3 \)
\( |\alpha\beta|=\frac{4\sqrt3}3 \)
\( |\alpha\beta|=\frac{3\sqrt3}2 \)
\( |\alpha\beta|=\frac{3\sqrt3}4 \)

1103212206

Level: 
C
A cube \( ABCDEFGH \) with an edge length of \( 2 \) is placed in a coordinate system (see the picture). Let \( p \) be a line of intersection of planes \( \alpha \) and \( \beta \), where \( \alpha \) is passing through \( C \), \( F \) and \( H \) and \( \beta \) is passing through \( A \), \( F \) and \( H \). Find the parametric equations of the line \( p \) and calculate the angle \( \varphi \) between planes \( \alpha \) and \( \beta \) . Round \( \varphi \) to the nearest minute.
\( \begin{aligned} p\colon x&=t, & \varphi&\doteq 70^{\circ}32' \\ y&=t, & &\\ z&=2;\ t\in\mathbb{R}, & & \end{aligned} \)
\( \begin{aligned} p\colon x&=2t, & \varphi&\doteq 90^{\circ} \\ y&=2t, & & \\ z&=2+2t;\ t\in\mathbb{R}, & & \end{aligned} \)
\( \begin{aligned} p\colon x&=t, & \varphi&\doteq 90^{\circ}\\ y&=t, & & \\ z&=2;\ t\in\mathbb{R}, & & \end{aligned} \)
\( \begin{aligned} p\colon x&=2t, & \varphi&\doteq 70^{\circ}32' \\ y&=2t, & & \\ z&=2t;\ t\in\mathbb{R}, & & \end{aligned} \)

1103212901

Level: 
C
A cube \( ABCDEFGH \) with an edge length of \( 2 \) units is placed in a coordinate system (see the picture). Find the distance of parallel lines \( p=KL \) and \( q=MN \), where points \( K \), \( L \), \( M \) and \( N \) are midpoints of edges \( CD \), \( BC \), \( EH \) and \( EF \) respectively.
\( |pq|=\sqrt6 \)
\( |pq|=2\sqrt3 \)
\( |pq|=3\sqrt2 \)
\( |pq|=2\sqrt2 \)