AMC 8 1994 Problem 4

AMC8 1994 年第 4 题

变换与对称★★☆☆☆
Which of the following represents the result when the figure shown below is rotated clockwise 120∘120^\circ about its center?
以下哪个表示将下图绕其中心顺时针旋转 120∘120^\circ 后的结果?
AMC 8 1994 Problem 4 figure
  1. A.选项 A 图示
  2. B.选项 B 图示
  3. C.选项 C 图示
  4. D.选项 D 图示
  5. E.选项 E 图示

正确答案 · Correct Answer

B

解析 · Solution

Solution 1

Rotating the circle 120∘120^\circ is 1/3 of a full turn. Going 1/3 clockwise of a full loop around the circle, the triangle would replace the square, the square would replace, the circle, and the circle would replace the triangle, (B)\text{(B)}.

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