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6930 = L.alas * 5
L.alas = 6930/5
L.alas = 1386 dm²
L alas = πr²
1386 = 22/7 * r²
r² = 1386 * 7/22
r² = 441
r = √441
r = 21 dm
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6930dm³=110/7 r²
r²=6930*110/7
=6930*7/110
r²=441
r=√441
r=21
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