d=9,4; r=9,4:2=4,7
a) c=2πr=2*3*4,7=28,2
b) S=πr²=3*4,7²=3*22,09=66,27
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d=9,4; r=9,4:2=4,7
a) c=2πr=2*3*4,7=28,2
b) S=πr²=3*4,7²=3*22,09=66,27