Answer:
r=3.399
Explanation:
82.3=1/2(4/3pir^3)
164.6=4/3pir^3
164.6*(3/4) = 123.45=pir^3
123.45/pi=39.2953554494=r^3
cube root of 39.2953554494 =3.399
r= around3.4
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