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# 第 33 课时　平移与旋转 - PowerPoint PPT Presentation

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A．6B．8C．10 D．12

1．平移的概念；

2．平移前后的两个图形的对应角、对应线段的关系．

C

A．25°B．30°

C．35°D. 40°

1．旋转的概念；

2．求旋转中心、旋转角；

3．求旋转后图形的位置和点的坐标．

B

(1)将△ABC向左平移6个单位长度得到△A1B1C1，请画出△A1B1C；

(2)将△ABC绕点O按逆时针方向旋转180°得到△A2B2C2，请画出△A2B2C2.

1．平移作图；

2．旋转作图；

3．平移、旋转的综合作图．

(2)将点A、B、C分别绕点O按逆时针方向旋转180°，得出对应点，即可得出△A2B2C2.

(2)如图所示：△A2B2C2即为所求．