如图，矩形的对角线，，则图中五个小矩形的周长之和为_______．

答案

28 解析：由勾股定理得，又，所以，

所以五个小矩形的周长之和为.

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如图，矩形的对角线，，则图中五个小矩形的周长之和为_______．

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