ABCD is a square, and the length of side is 60. DE is a quarter arc with C as the center and CD as the radius. EF is a quarter arc with B as the center and BE as the radius. FG is a quarter arc with A as the center AF as the radius. GH is a quarter arc with D as the center DG as the radius. What is the total length of arcs DE + EF + FG + GH?
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A180π
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B220π
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C240π
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D275π
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E300π
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正确答案: E