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(2) (3) (4)

(2) (3) (4). (5) (6) (7). (1) (4)(5) (7) 是 封闭图形 (2) (3) (6) 是 不封闭图形. 周长 —— 封闭 图形 一周 的长度。. 宽. 长方形的周长 = （ 长 + 宽 ） ×2. 长. 正方形的周长 = 边长 ×4. 边长. ● 一块长方形的台布，长 5 分米，宽 4 分米，在它的四周绣上花边。花边长多少分米？. （ 5+4 ） ×2.

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(2) (3) (4)

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  1. (2) (3) (4) (5) (6) (7) (1) (4)(5) (7)是封闭图形 (2) (3) (6)是不封闭图形 周长——封闭图形一周的长度。

  2. 宽 长方形的周长=（长+宽）×2 长 正方形的周长=边长×4 边长

  3. ●一块长方形的台布，长5分米，宽4分米，在它的四周绣上花边。花边长多少分米？●一块长方形的台布，长5分米，宽4分米，在它的四周绣上花边。花边长多少分米？ （5+4）×2

  4. ● 一个正方形的场地，周围栏杆长是608米。 一边的长是多少米？ ●长方形的花坛，周长30米，长是8米。宽是 多少米？

  5. 比较下面两个图形谁的周长长？ 3cm 3cm 4cm 4cm

  6. 请你画一个周长是24cm的长方形

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