Kruh
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   Príkladové výpočty  | 
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   Rozmery:  | 
  
   Obsah:  | 
  
   Obvod:  | 
 
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   r = 3 cm p = 3,142  | 
  
   S = p . r2 S = ? (cm2) S = 3,142 . 32 S = 3,142 . 9 S = 28,278 S = 28,278 cm2  | 
  
   O = 2 . p . r O = ? (cm) O = 2 . 3,142 . 3 O = 18,852 O = 18,852 cm  |