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3,14 x 10cm = 31,4cm
2. 3,14 x 12cm = 37,68cm
3. 3,14 x 5cm = 15,7cm
2.) = TT x d = 3,14 x 12 = 37,68
3.) = TT x d = 3,14 x 5 = 15,70 ( 15,7 )