K = 2πr
3,14 π = 2 π r
3,14 π / 2 π = r
1,57 = r
L = πr²
= π . 1,57.1,57
= 2,4649π cm²
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K = 2πr
3,14 π = 2 π r
3,14 π / 2 π = r
1,57 = r
L = πr²
= π . 1,57.1,57
= 2,4649π cm²