Analytical space geometry

1103212905

Level: 
C
A rectangle-based right pyramid \( ABCDV \) with its bottom edge length of \( 6 \) units and the perpendicular height of \( 6 \) units is placed in a coordinate system (see the picture). Find the parametric equations of an intersection line \( p \) of planes \( \alpha \) and \( \beta \), where \( \alpha \) passes through the points \( B \), \( C \) and \( V \), and \( \beta \) passes through the points \( A \), \( D \) and \( V \). What is the measure of an angle \( \varphi \) between the planes \( \alpha \) and \( \beta \). Round \( \varphi \) to the nearest minute.
\(\begin{aligned} p\colon x&=3+t, & \varphi\doteq 53^{\circ}8'\\ y&=3, &\\ z&=6;\ t\in\mathbb{R} & \end{aligned}\)
\(\begin{aligned} p\colon x&=3+t, & \varphi\doteq 63^{\circ}8'\\ y&=3, &\\ z&=0;\ t\in\mathbb{R} & \end{aligned}\)
\(\begin{aligned} p\colon x&=3+t, & \varphi\doteq 53^{\circ}8'\\ y&=3+t, &\\ z&=6+2t;\ t\in\mathbb{R} & \end{aligned}\)
\(\begin{aligned} p\colon x&=3+t, & \varphi\doteq 63^{\circ}8'\\ y&=3, &\\ z&=6;\ t\in\mathbb{R} & \end{aligned}\)

1103212904

Level: 
C
A rectangle-based right pyramid \( ABCDV \) with a bottom edge length of \( 6 \) units and the perpendicular height of \( 6 \) units is placed in a coordinate system (see the picture). Let \( S \) be the midpoint of the edge \( AD \). Find the standard equation of the plane \( \alpha \) passing through the points \( B \), \( V \) and \( C \), and calculate the distance of the point \( S \) from \( \alpha \).
\( \alpha\colon 2y+z-12=0;\ d=|S\alpha|=\frac{12\sqrt5}{5} \)
\( \alpha\colon 2x+z-12=0;\ d=|S\alpha|=\frac{12\sqrt5}{5} \)
\( \alpha\colon 2y+z-12=0;\ d=|S\alpha|=\frac{6\sqrt5}{5} \)
\( \alpha\colon 2x+z-12=0;\ d=|S\alpha|=\frac{6\sqrt5}{5} \)

1103212903

Level: 
C
A cube \( ABCDEFGH \) with an edge length of \( 2 \) units is placed in a coordinate system (see the picture). Find an angle \( \varphi \) between the plane \( \alpha \) passing through the points \( E \), \( D \) and \( C \) and the straight line \( AF \). Hint: An angle between a line and a plane is an angle between the line and its orthogonal projection into this plane.
\( \varphi = 30^{\circ} \)
\( \varphi = 15^{\circ} \)
\( \varphi = 45^{\circ} \)
\( \varphi = 60^{\circ} \)

1103212902

Level: 
C
A cube \( ABCDEFGH \) with an edge length of \( 2 \) units is placed in a coordinate system (see the picture). Let \( S \) be the midpoint of the face \( ABFE \), and let \( K \) and \( L \) be the midpoints of edges \( DH \) and \( CG \) consecutively. Find the standard equation of a plane \( \alpha \) passing through the points \( A \), \( B \) and \( L \), and calculate the distance of the point \( S \) from \( \alpha \).
\( \alpha\colon x+2z-2=0;\ |S\alpha|=\frac{2\sqrt5}{5} \)
\( \alpha\colon x+2z-2=0;\ |S\alpha|=\frac{2\sqrt3}{3} \)
\( \alpha\colon x+2y-2=0;\ |S\alpha|=\frac{2\sqrt5}{5} \)
\( \alpha\colon x+2y-2=0;\ |S\alpha|=\frac{2\sqrt3}{3} \)

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.
\( |pq|=\sqrt6 \)
\( |pq|=2\sqrt3 \)
\( |pq|=3\sqrt2 \)
\( |pq|=2\sqrt2 \)

1003188803

Level: 
A
A plane \( \rho \) is defined by the point \( A=[3;1;1] \) and a straight line \( p \) defined by the following parametric equations: \begin{align*} p\colon x&=4+4t, \\ y&=-1-2t, \\ z&=1+t;\ t\in\mathbb{R} \end{align*} Find the parametric equations of the plane \( \rho \).
$\begin{aligned} \rho\colon x&=4+4t+s, \\ y&=-1-2t-2s, \\ z&=1+t;\ t,s\in\mathbb{R} \end{aligned}$
$\begin{aligned} \rho\colon x&=4+4t+3s, \\ y&=-1-2t+s, \\ z&=1+t+s;\ t,s\in\mathbb{R} \end{aligned}$
$\begin{aligned} \rho\colon x&=3+4t+4s, \\ y&=1-2t-s, \\ z&=1+t+s;\ t,s\in\mathbb{R} \end{aligned}$
$\begin{aligned} \rho\colon x&=3+4t-4s, \\ y&=1-2t+2s, \\ z&=1+t-s;\ t,s\in\mathbb{R} \end{aligned}$

1003188802

Level: 
A
Find the missing coordinates of the points\( M=[2;m;0] \) and \( N=[0;3;n] \) so that they lie on a plane \( \rho \) defined by the following parametric equations: \begin{align*} \rho\colon x&=4+2s, \\ y&=-1-2t, \\ z&=1+t+s;\ t,s\in\mathbb{R} \end{align*} Choose the option in which values of both \( m \) and \( n \) are correct.
\( m=-1 \), \( n=-3 \)
\( m=-1 \), \( n=3 \)
\( m=1 \), \( n=-3 \)
\( m=1 \), \( n=3 \)