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# 图形的变换 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '图形的变换' - iain

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A

B

A

O

O

900

B

A

A

O

O

C

900

B

A

A

O

O

D

C

900

A

A

A

A

B

B

B

O

O

O

O

C

C

D

900

900

900

A

C

B

C

A

C

A

B

C

C

C

C

A

B

A

A

A

B

B

B

（1）以点A为中心旋转的图形是（ ）；

（2）以点B为中心旋转的图形是（ ）；

（3）以点C为中心旋转的图形是（ ）。

1.转一转，说一说。

3

2

4

1

（1）图形2绕点O逆时针旋转90度到图形（ ）所在的位置；

2.

1

（2）图形2绕点O顺时针旋转90度到图形（ ）所在的位置；

3

O

（3）图形2绕点O顺时针旋转（ ）到图形4所在的位置。

180度

A

B

B

A

B

A

B

A

一些简单的图形，经过不同角度的旋转，可以得到各种美丽的图案。