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平面图形的周长和面积总复习 PowerPoint PPT Presentation


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平面图形的周长和面积总复习. 富安小学:王震. 唐僧取经回来后,想把一座山地奖给三个徒弟,唐僧拿出三条同样长的绳子,叫三位徒弟用绳子各围一块地。八戒抢着说,我要围成长方形 ; 沙僧接着说,我要围成正方形 ; 悟空灵机一闪,得意的说,我要围成圆形。. 你猜一猜,三个徒弟谁围的面积最大?. 小学阶段你学习过哪些平面图形?. 所有边长的总和 —— 周长. 计量周长的常用单位有哪些?. 米;分米;厘米. 表面或围成的平面图形的大小 —— 面积. 常用的面积单位有哪些?. 平方米;平方分米;平方厘米. 4 a. (a+b)×2. π d 或 2πr. a 2. ab.

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平面图形的周长和面积总复习

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4 a

(a+b)2

d 2r

a2

ab

r2

S =

S =

S =

C =

C =

C =

ah2

(a+b)h2

ah

S =

S =

S =


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a

h

a

b

a

a

h

b

C =

C =

C =

r

4 a

a2

S =

ah2

S =

h

a

ah

S =

(a+b)2

ab

(a+b)h2

S =

S =

2r

r2

S =


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8cm

6cm

5cm

4cm

4cm

10cm

8cm

6cm

6cm

4cm

7cm

4.8cm

5cm

10cm


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31.4.7


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3

1

5

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=


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3

3

1

=

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