A.\(6\)
B.\(3\)
C.\(4\)
D.\(2\)

A.\(2\pi \)
B.\(32\pi \)
C.\(\dfrac{{8\pi }}{3}\)
D.\(8\pi \)

A.\(340\) (mét)
B.\(420\) (mét)
C.\(400\) (mét)
D.\(320\) (mét)

A.\(B\left( {1; - 1;1} \right)\)
B.\(A\left( {1; - 1; - 3} \right)\)
C.\(C\left( {1; - 1;2} \right)\)
D.\(D\left( {1; - 1; - 2} \right)\)

A.\({60^0}\)
B.\({30^0}\)
C.\({45^0}\)
D.\({90^0}\)

A.\(\sqrt {10} \)
B.\(\sqrt 6 \)
C.\(2\sqrt 2 \)
D.\(2\sqrt 3 \)

A.\(\dfrac{{\sqrt {30} a}}{3}\)
B.\(\dfrac{{\sqrt {10} a}}{3}\)
C.\(\dfrac{{\sqrt {30} a}}{{10}}\)
D.\(\dfrac{{\sqrt {33} a}}{3}\)

A.\(4\)
B.\(5\)
C.\(1\)
D.Vô số

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

A.\(\left( {1;2} \right)\)
B.\(\left( { - 2; - 1} \right)\)
C.\(\left( {0;1} \right)\)
D.\(\left( { - 1;0} \right)\)