2022 AMC 8 第 4 题
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所有题目均经美国数学协会(MAA)官方合法授权使用。
4.
下图中的字母 M 先关于直线 反射,再关于直线 反射。得到的图像是哪一个?
The letter M in the figure below is first reflected over the line and then reflected over the line What is the resulting image?
小提示:
关于 反射会把字母移到对角线的另一侧
Reflecting over moves the letter across the diagonal line
大提示:
第一次反射后,再把新图像关于水平线 反射
After the first reflection, reflect the new image over the horizontal line
解答:
先把字母关于斜线 镜像,再把得到的图像关于水平线 镜像。最终图像位于 下方、竖直线右侧,方向与选项 E 相同。
正确答案是 E。
Reflecting over the diagonal line changes the orientation of the letter as if the diagonal were a mirror. Reflecting that image over the horizontal line then places the final letter below , to the right of the vertical line, with the orientation shown in choice E.
Thus, the correct answer is E.
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