3388 = 22/7 × r × r × 23
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((is) means =)
r*r is r²
22/7 × r × r × 23 is 506/7 * r²
506/7 * r² is 3388
r² is 3388 divided by 506/7
r² is 3388* 7/506
r² is 23716/506
r² is 46.86956521739
r is √ 46.86956521739
r is 6.846135056905
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