For each circle equation shown below state the coordinates of its center and the length of its radius.
1.) x^2 +y^2=16
2.) (x-8)^2+(y+3)^2=100
3.) (x+2)^2 + (y+7)^2=49
4.) (x-6)^2 +y^2=1
5.) x^ +y^2= 25
6.) (x-3)^2+(y-8)^2=64

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