Make a cuboid packing box for a cylindrical part with a bottom diameter of 8 decimeters and a height of 3 decimeters. What is the minimum square decimeter of wood used to make this packing box?
给一个底面直径8分米、高3分米的圆柱零件做一个长方体包装箱，做这个包装箱最少要用木板多少平方分米．
<gadget id="calculator">64 + 48</gadget>
<output>112</output>

<gadget id="calculator">112 * 2</gadget>
<output>224</output>

<result>224</result>