Lines and planes: distances and angles

2010015810

Level: 
B
The picture shows a square pyramid. The side of a base square is \(a = 10\; \mathrm{cm}\) and the height of the pyramid is \(v = 10\; \mathrm{cm}\). Find the angle \(\varphi \) between the lateral edge and the edge of the base of the pyramid.
\(\mathop{\mathrm{tg}}\nolimits {\varphi} = \sqrt5 \mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 65^{\circ }54^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits \varphi = \frac{\sqrt5} {5}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 24^{\circ }6^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits \frac{\varphi}{2} = \frac{\sqrt5} {5}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 48^{\circ }11^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits {\varphi} = \frac{\sqrt{10}} {2}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 57^{\circ }41^{\prime}\)

2010015809

Level: 
B
The picture shows a square pyramid \(ABCDV\). The side of a base square is \(a = 6\; \mathrm{cm}\) and the height of the pyramid is \(v = 8\; \mathrm{cm}\). Find the angle \(\varphi \) between the opposite lateral edges (the angle \(AVC\)).
\(\mathop{\mathrm{tg}}\nolimits \frac{\varphi}2 = \frac{3\sqrt2} {8}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 55^{\circ }53'\)
\(\mathop{\mathrm{tg}}\nolimits \varphi = \frac{3\sqrt2} {8}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 27^{\circ }56^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits \frac{\varphi}{2} = \frac{3} {8}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 41^{\circ }7^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits \frac{\varphi}2 = \frac{8} {3\sqrt2}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 124^{\circ }7^{\prime}\)

2010015808

Level: 
B
The picture shows a square pyramid. The side of a base square is \(a = 6\; \mathrm{cm}\) and the height of the pyramid is \(v = 10\; \mathrm{cm}\). Find the angle \(\varphi \).
\(\mathop{\mathrm{tg}}\nolimits \varphi = \frac{10} {3\sqrt2}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 67^{\circ }\)
\(\mathop{\mathrm{tg}}\nolimits \varphi = \frac{10} {3}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 73^{\circ }18^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits \frac{\varphi}{2} = \frac{3\sqrt2} {10}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 45^{\circ }59^{\prime}\)
\(\mathop{\mathrm{tg}}\nolimits \frac{\varphi}2 = \frac{3} {10}\mathrel{\implies }\varphi \mathop{\mathop{\doteq }}\nolimits 33^{\circ }24^{\prime}\)

2010015807

Level: 
A
The sides of a rectangular box shown in the picture are \(a = 3\, \mathrm{cm}\), \(b = 4\, \mathrm{cm}\), and \(c = 12\, \mathrm{cm}\). The space diagonal is \(u_{t}\) and the shortest face diagonal is \(u_{s}\). Find the ratio \(u_{s} : u_{t}\).
\(5 : 13\)
\(13 : 5\)
\(13\sqrt{10}:40\)
\(4\sqrt{10}:13\)

2010015806

Level: 
C
The side of a regular hexagonal prism \(ABCDEFA'B'C'D'E'F'\) shown in the picture is \(a = 3\, \mathrm{cm}\) and the height is \(v = 8\, \mathrm{cm}\). Find the angle between the diagonal \(AC'\) and the base plane \(ABC\) (round your result to the nearest degree).
\(57^{\circ }\)
\(53^{\circ }\)
\(33^{\circ }\)
\(38^{\circ }\)

2010015805

Level: 
A
A cuboid has sides \(a = 6\, \mathrm{cm}\) and \(b = 8\, \mathrm{cm}\), and the space diagonal \(u = 11\, \mathrm{cm}\). Find the length of the side \(c\) (see the picture).
\( \sqrt{21}\,\mathrm{cm} \)
\( \sqrt{221}\,\mathrm{cm} \)
\( 21\,\mathrm{cm} \)
\( 10\,\mathrm{cm} \)

2010015804

Level: 
B
The base \( ABCD \) of a square pyramid \( ABCDV \) has an edge of \( 6\,\mathrm{cm} \). The height of the pyramid is \( 3\sqrt2\,\mathrm{cm} \). Find the distance between the point \( A \) and the line \( CV \) (see the picture).
\( 6\,\mathrm{cm} \)
\( 3\sqrt{3}\,\mathrm{cm} \)
\( 9\,\mathrm{cm} \)
\( 3\sqrt{2}\,\mathrm{cm} \)

2010015802

Level: 
C
Let \( ABCDEFV \) be a regular hexagonal pyramid with a base edge length of \( 4\,\mathrm{cm} \) and a height of \( 8\,\mathrm{cm} \). Find the distance between the point \( V \) and the line \( BD \) (see the picture).
\( 2\sqrt{17}\,\mathrm{cm} \)
\( 4\sqrt{3}\,\mathrm{cm} \)
\( 2\sqrt{19}\,\mathrm{cm} \)
\( 2\sqrt{20}\,\mathrm{cm} \)

2010015801

Level: 
C
Let \( ABCDEFA'B'C'D'E'F' \) be a regular hexagonal prism with the base edge length of \( 4\,\mathrm{cm} \) and the height of \( 6\,\mathrm{cm} \). Find the distance between the lines \( FA \) and \( D'C' \) (see the picture).
\( 2\sqrt{21}\,\mathrm{cm} \)
\( 4\sqrt{3}\,\mathrm{cm} \)
\( 10\,\mathrm{cm} \)
\( 2\sqrt{13}\,\mathrm{cm} \)