1995 AMC 12 第 6 题

Question

图示展开图可以折成一个立方体。在折成的立方体中，哪个标有字母的面与标记为

x

的面相对？

The figure shown can be folded into the shape of a cube. In the resulting cube, which of the lettered faces is opposite the face marked

x?

A

B

C

D

E

固定面

A

，将每个相邻正方形折起

90^\circ

Hold face

A

fixed and fold each neighboring square by

90^\circ

沿展开图移动时，追踪每个面的外法线方向

Track the outward normal direction of each face as you move through the net

将

A

固定为正面。折叠后，

x

成为左面，

B

成为上面。面

C

与

B

的右侧相连，随后折成右面，正好与

x

相对。因此正确答案是 C。

Hold

A

as the front face. Folding makes

x

the left face and

B

the top face. The face

C,

attached to the right of

B,

then folds to the right face, opposite

x.

Thus the correct answer is C.

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