D=4
1)P=2пR=пD=3,14*4=12,56
2)S=пR^2=п*(0,5D)^2=3,14*4=12,56
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D=4
1)P=2пR=пD=3,14*4=12,56
2)S=пR^2=п*(0,5D)^2=3,14*4=12,56