A processing factory in Enyang Industrial Park is going to make a cuboid metal ventilation pipe with a length of 16 meters, and the ventilation opening is a square with a side length of 0.2 meters. How many square meters of iron sheet is needed to make such a ventilation pipe?
恩阳工业园某加工厂要做一个长方体形的铁皮通风管，长16米，通风口是边长为0.2米的正方形．做这样一个通风管需要多少平方米铁皮？
<gadget id="calculator">0.2 * 4 * 16</gadget>
<output>12.8</output>

<result>12.8</result>