A.\(8\pi \).
B.\(\dfrac{{16\sqrt 3 \pi }}{3}\).
C.\(\dfrac{{8\sqrt 3 \pi }}{3}\).
D.\(16\pi \).

A.\(\left( {4\,;\, + \infty } \right)\).
B.\(\left( { - 4\,;\,4} \right)\).
C.\(\left( { - \infty \,;\,4} \right)\).
D.\(\left( {0\,;\,4} \right)\).

A.\(4\).
B.\(1\).
C.\(2\).
D.\(3\).

A.\(\dfrac{{x - 1}}{4} = \dfrac{y}{5} = \dfrac{{z - 1}}{{ - 1}}\).
B.\(\dfrac{{x + 1}}{2} = \dfrac{y}{3} = \dfrac{{z + 1}}{{ - 1}}\).
C.\(\dfrac{{x - 1}}{2} = \dfrac{y}{3} = \dfrac{{z - 1}}{{ - 1}}\).
D.\(\dfrac{{x + 1}}{4} = \dfrac{y}{5} = \dfrac{{z + 1}}{{ - 1}}\).

A.\(N\left( { - 2\,;\,2} \right)\).   
B.\(M\left( {4\,;\,2} \right)\).
C.\(P\left( {4\,;\, - 2} \right)\).
D.\(Q\left( {2\,;\, - 2} \right)\).

A.\(3x + 2y - z + 1 = 0\).
B.\(2x - 2y + 3z - 17 = 0\).
C.\(3x + 2y - z - 1 = 0\).
D.\(2x - 2y + 3z + 17 = 0\).

A.\(36\).
B.\(\dfrac{4}{3}\).
C.\(\dfrac{{4\pi }}{3}\).
D.\(36\pi \).

A.\(5\).
B.\(3\).
C.\(\dfrac{{13}}{3}\).
D.\(\dfrac{7}{3}\).

A.\(45^\circ \).
B.\(30^\circ \).
C.\(60^\circ \).
D.\(90^\circ \).

A.\(\dfrac{{\sqrt {21} a}}{{14}}\).
B.\(\dfrac{{\sqrt 2 a}}{2}\).
C.\(\dfrac{{\sqrt {21} a}}{7}\).
D.\(\dfrac{{\sqrt 2 a}}{4}\).