把四根半径均为1 cm的铜管捆成如图(从底面方面看)的形状，如果接头处不计，至少需要________ cm的绳子。(答案保留π)

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问题把四根半径均为1 cm的铜管捆成如图(从底面方面看)的形状，如果接头处不计，至少需要________ cm的绳子。(答案保留π)

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