Answers

2016-06-23T22:48:07+08:00
Center is (0,0) and the radius is 5.
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2016-06-24T01:28:01+08:00
      formula for equation of a circle at  center (0,0)
            =    x²+y² =  r²
             since r² = 5
              ∴   r   =   √5
           answer :           center  at  (0,0)   and radius  =  √5
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