Answers

2014-09-28T20:21:20+08:00
The answer is 6.594 cm

radius (r) = 3.14
  
           3.14 --- there was 2 decimal point
         ×  2.1 --- there was 1 decimal point
       ------------
             314
      +    628
     --------------
         6.594 --- answer
1 5 1