Unit two lively folk festival -- symmetry 热闹的民俗节——对称 What questions can you ask? 你能提出什么问题？ What do these three pictures have in common? 这三幅图有什么共同特点？ I found the top and bottom sides of the goldfish are the same. 我发现金鱼的上下两边是一样的。 I found the left and right sides of the kite were the same. 我发现风筝的左右两边是一样的。 These objects are symmetric. 这些物体都是对称的。 Fold the following figure (see attached page) in half, what do you find 将下面的图形（见附页）对折，你有什么发现？ I found that when folded in half, the two sides of these figures coincide exactly. 我发现，对折后这些图形的两边完全重合。 An axisymmetric figure is one that can be folded in half like this 像这样对折后能够完全重合的图形是轴对称图形。 Is the figure cut by the following method axisymmetric? 用下面的方法剪出的图形是轴对称图形吗？ These figures are axisymmetric because...... 这些图形是轴对称图形，因为...... |
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