AMC8 2005
AMC8 2005 · Q3
AMC8 2005 · Q3. It mainly tests Transformations, Symmetry.
What is the minimum number of small squares that must be colored black so that a line of symmetry lies on the diagonal BD of square ABCD?
要使正方形 ABCD 的对角线 BD 成为对称轴，需要将多少个小正方形涂成黑色？
(A)
1
1
(B)
2
2
(C)
3
3
(D)
4
4
(E)
5
5
Answer
Correct choice: (D)
正确答案：（D）
Solution
(D) For diagonal $BD$ to lie on a line of symmetry in square $ABCD$, the four small squares labeled $bl$ must be colored black.
（D）为了使对角线 $BD$ 位于正方形 $ABCD$ 的一条对称轴上，标记为 $bl$ 的四个小正方形必须涂成黑色。
Topics
Related Questions
Practice full AMC exams on amcdrill.
Try full-length practice and diagnostics at www.amcdrill.com.