Đường tròn \[\left( C \right):{x^2} + {y^2} - 6x + 2y + 6 = 0\] có tâm I, bán kính R lần lượt là:

A. d: x + y + 1 = 0;                        

B. d: x - 2y - 11 = 0;

C. d: x - y - 7 = 0;

D. d: x - y + 7 = 0.

A.   \[{\left( {x + 2} \right)^2} + {\left( {y - 3} \right)^2} = \sqrt {52} ;\]

B. \[{\left( {x - 2} \right)^2} + {\left( {y + 3} \right)^2} = 52;\]

C.   \[{x^2} + {y^2} + 4x - 6y - 57 = 0;\]                    

D. \[{x^2} + {y^2} + 4x - 6y - 39 = 0.\]

A.   \[{\left( {x + 2} \right)^2} + {\left( {y - 3} \right)^2} = 5;\]             

B. \[{\left( {x + 1} \right)^2} + {\left( {y + 2} \right)^2} = 17;\]

C. \[{\left( {x - 2} \right)^2} + {\left( {y + 3} \right)^2} = \sqrt 5 ;\]      

D. \[{\left( {x - 2} \right)^2} + {\left( {y + 3} \right)^2} = 5.\]

A. \[{x^2} + {y^2} + 2x + 4y - 4 = 0;\]                      

B. \[{x^2} + {y^2} + 2x - 4y - 4 = 0;\]

C. \[{x^2} + {y^2} - 2x + 4y - 4 = 0;\]                       

D. \[{x^2} + {y^2} - 2x - 4y - 4 = 0.\]

A. I (-1; 0), S = 8;

B. I (-1; 0), S = 64;

C. I (-1; 0), S = 6\[\sqrt 2 \];           

D. I (1; 0), S = \[2\sqrt 2 \];

A. \[{\left( {x + 1} \right)^2} + {\left( {y - 5} \right)^2} = 26;\]             

B. \[{\left( {x + 1} \right)^2} + {\left( {y - 5} \right)^2} = \sqrt {26} ;\]

C.   \[{\left( {x - 1} \right)^2} + {\left( {y + 5} \right)^2} = 26;\]           

D. \[{\left( {x - 1} \right)^2} + {\left( {y + 5} \right)^2} = \sqrt {26} .\]

A. 2x + y + 1 = 0 hoặc 2x + y - 1 = 0;                        

B. 2x + y = 0 hoặc 2x + y - 10 = 0;

C. 2x + y + 10 = 0 hoặc 2x + y - 10 = 0;                     

D. 2x + y = 0 hoặc 2x + y + 10 = 0.