A.\(m = 2\)
B.\(m = 0\)
C.\(m = 1\)
D.\(m =  - 1\)

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

A.\(20cm\)
B.\(18cm\)
C.\(19cm\)
D.\(16cm\)

A.\(R\sqrt 2 \)
B.\(2R\)
C.\(R\sqrt 3 \)
D.\(\dfrac{{3R}}{2}\)

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

A.\(2\sqrt 2 \;cm\)
B.\(4\,\,cm\)
C.\(2\,cm\)
D.\(\sqrt 2 \;cm\)

A.\({60^0}\)
B.\({45^0}\)
C.\({22^0}30'\)
D.\({30^0}\)

A.\(2cm\)
B.\(4cm\)
C.\(6cm\)
D.\(2\sqrt 2 cm\)

A.\({90^0}\)
B.\({120^0}\)
C.\({45^0}\)
D.\({60^0}\)

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