Answers

2016-02-24T17:36:03+05:30
2 x pie x r x r x 20= 628cm
2 x 3.14 x r x r x 20 = 628cm
  6.28 x 20 x r x r = 628cm
125.60 - 628 = r sq. 
554.40 = r sq. 
 therefore 2/ 554.40= 277.20
answer is 277.20 
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Volume of cylinder is (pie) r^2 h
2016-02-24T18:03:24+05:30
Volume of cylinder = 628 cu cm
But the volume of the cylinder = πr²h
πr²h = 628
3.14 × r² × 20 = 628
62.8 × r² = 628
r² = 10
r = √10 cm
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