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Junior high school champion, sixth grade, People's Education Edition, Volume I, Math P42, wonderful answer.
00 answer:

00 formula: 4× 2+2× 3.14×1=14.28 decimeter.

00 analysis: the length of the wire is actually the circumference of four circles, which consists of four 2- decimeters and a quarter of the circumference of four circles, as shown in the following figure:

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