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日常生活中,同学们或许都曾到街边的鞋摊修过鞋。你可曾发现这么一个有趣的现象:鞋匠们打鞋掌时用的铁钉的形状很独特,它们的横截面不像普通的铁钉那样是圆形的,而是三角形或正方形. 这是什么原因呢?下面我们用数学知识来解开其中的奥秘.
In everyday life, students may have used shoes in shoe stalls on the street. You have discovered an interesting phenomenon: the nails used by the shoemakers when they hit the soles of the shoes are unique in shape. Their cross-sections are not as round as ordinary nails, but are triangular or square. What is this? Why? Here we use mathematical knowledge to solve the mysteries.