A:You’d better not.
B:Why not travel abroad?
C:I am glad you did.
D:Sounds like a good idea.
将三角形各边向外平移1个单位并适当延长,得到如图(1)所示的图形,变化前后的两个三角形相似吗?如果把三角形改为正方形、长方形呢?