1 / 16

计算组合图形面积

计算组合图形面积. s = πr. 2. 计算组合图形面积. S=a×b. S=a×a. S=a×h. S =a×b÷2. S=(a+b) ×h÷2. 方法:1 . 割  2 . 补 3 .去重 4 . 拼  5 . 移 6 . 一半. 1. = 3.14×8. 1. S =S  ×. =3.14×4×4 ×. 圆. 阴. 2. 2. = 25.12 (c ㎡ ). 计算组合图形面积. r = 8÷2 = 4 (㎝). d=8㎝. 1. = 3.14×9. 1. S =S  ×. =3.14×6×6 ×. 圆. 阴. 4. 4.

Download Presentation

计算组合图形面积

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 计算组合图形面积

  2. s = πr 2 计算组合图形面积 S=a×b S=a×a S=a×h S =a×b÷2 S=(a+b) ×h÷2 方法:1.割  2.补 3.去重 4.拼 5.移 6.一半

  3. 1 =3.14×8 1 S =S × =3.14×4×4× 圆 阴 2 2 =25.12 (c㎡) 计算组合图形面积 r = 8÷2 = 4 (㎝) d=8㎝

  4. 1 =3.14×9 1 S =S × =3.14×6×6× 圆 阴 4 4 =28.26 (c㎡) 计算组合图形面积 r=6㎝

  5. 一个圆形金鱼池的半径是8米,周围有一条2米宽的小路(如图)。这条小路的占地面积是多少平方米?一个圆形金鱼池的半径是8米,周围有一条2米宽的小路(如图)。这条小路的占地面积是多少平方米? 2m 8m 8+2=10(m) 3.14×(102-82) =3.14 ×36 =113.04(m2) 答:它的面积是113.04 m2。

  6. 计算组合图形面积 r=10㎝

  7. 计算组合图形面积 r=10㎝

  8. 计算组合图形面积 r=10㎝

  9. 计算组合图形面积 r=6㎝

  10. 求图中阴影面积(单位:分米)

  11. 求图中阴影面积(单位:分米)

  12. 求图中阴影面积(单位:分米)

  13. 求下面各阴影部分的面积. 5 10 r=8dm d=8cm d=6cm

  14. 计算组合图形面积

  15. 求图中阴影面积.(单位:厘米) b c d a

  16. . 请发挥你的想象力! 下图中,大圆的半径是10厘米,小圆的半径是2厘米.现在让小圆沿着大圆的内侧滚动一周,那么, (1)小圆的圆心走过的路程是多少? (2)小圆滚过的面积是多少? 演示2 演示1

More Related