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28.15×4=112.6(米)答:籬笆的長是112.6米.一圈籬笆就是圍著正方形花圃一圈的周長,籬笆的長度就是花圃的周長,花圃是正方形的,所以正方形花圃的周長公式是:正方形的周長=邊長×4算出來也就是籬笆的長度.
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