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成卷胶片、纸、塑料薄膜可应用下列两张图快速求出此卷材料的长度或卷外径。例1.已知厚度为150微米的胶片,卷在直径为7.5厘米的卷轴上,卷外径为37.5厘米,问其总长为多少?
Roll film, paper, plastic film The following two figures can be used to quickly find out the length or roll diameter of this roll of material. Example 1. A film having a thickness of 150 microns is known. It is wound on a 7.5 cm diameter reel with a roll outer diameter of 37.5 cm. What is the total length?