A ventilation pipe in the shape of a cuboid is 1 meter long. The side length of the cross section is 4 decimeters, how many square decimeters of iron sheets are needed to make such a ventilation pipe? ..
一个长方体形状的通风管，长1米．横截面的边长是4分米，做这样的通风管至少需要多少平方分米的铁皮？..
<gadget id="calculator">4 * 4 * 1 * 10</gadget>
<output>160</output>

<result>160</result>