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题目 用一块边长为60 cm的正方形薄钢片制作一个长方体盒子。 (1)如果要做成一个没有盖的长方体盒子,可先在薄钢片的四个角上截去四个相同的小正方形(如图1),然后把四边折合起来(如图2).
Title A rectangular box was made from a square steel sheet with a side length of 60 cm. (1) If you want to make a rectangular box with no cover, first cut off the same four small squares on the four corners of the thin steel sheet (Figure 1), and then fold the four sides together (see Figure 2).