Answer: radius = 4
Step-by-step explanation:
The equation of circle is [tex](x - h)^{2} +(y - k)^{2} =r^{2}[/tex]
So [tex]3((x-5)^{2}+ (y+9)^{2} )=48[/tex]
[tex](x-5)^{2}+(y+9)^{2}=16[/tex]
So [tex]r^{2} = 16[/tex]
[tex]r=4[/tex]
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