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行测-图形推理-3-对称图形类
2022-07-07 21:47:00 【Caspian�】
当观察到图形都是较规整但元素组成凌乱时,可以考虑对称性质的考察。
本篇将主要针对考察对称性质的题目,对称的考查方式有以下几个方面:
下面针对不同类型给出例题:
目录
一、对称的类型
(1)
1,3,6为对称图形;2,4,5为非对称图形。
(2)
图形依次为轴对称、中心对称、轴对称、中心对称、轴对称,下一个选择中心对称图形C。
(3)
1,2,4为轴对称图形;3,5,6为中心对称图形。
二、对称轴
1.对称轴数量
(1)
对称轴数量为1,2,3,4,故选择对称轴数量为5的D。
(2)
第一组图形对称轴数量为0,1,2;故在第二组图形中选对称轴数量为1且对称轴方向指向左上方45度的B。
(3)
1,4,5有两条对称轴;2,3,6有一条对称轴。
2.对称轴方向
(1)
第一组图形对称轴依次顺时针旋转45度;故选C(B为椭圆)。
(2)
按行寻找规律,对称轴方向顺时针旋转45度。故选B。
(3)
对称轴方向依次顺时针旋转45度,故选A。
(4)
每一组图形对称轴方向一致,故选A。
3.对称轴夹角
(1)
每个图形由两个小图形,这两个小图形对称轴夹角依次为180度、45度、90度,故选D。
(2)
第一组图形两个小图形对称轴夹角均为90度;第二组图形两个小图形夹角均为180度,故选D
4.对称轴与图形位置关系
(1)
观察每个图形对称轴的方向,由对称轴的方向规律可以排除AC。再观察从第一个图形开始,对称轴与原图像的一条边重合、垂直、重合、垂直、重合,故选择无重合的B。
(2)
由对称轴方向规律锁定AC,再观察对称轴有无和原图像边重合的规律知答案选C。
(3)
1,4,5对称轴与原图像交于边;2,3,6对称轴与原图像交于点。
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