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We have measured the absolute branching ratio of the K+ -> pi+ pi0 (gamma)decay, using about 20 million tagged K+ mesons collected with the KLOE detectorat DAFNE, the Frascati phi-factory. Signal counts are obtained from the fit ofthe distribution of the momentum of the charged decay particle in the kaon restframe. The result, inclusive of final-state radiation, is BR(K+ -> pi+ pi0(gamma))=0.2065+/-0.0005_{stat}+/- 0.0008_{syst}.

Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector