There is a cylinder of wood with a length of 4 decimeters. If it is sawn vertically along the bottom diameter, the surface area will increase by 48 square decimeters. What is the lateral area of this cylinder of wood?
有一根圆柱体木料，长4分米，如果沿着底直径把它垂直锯开，这样表面积比原来增加48平方分米，这段圆柱木料的侧面积是多少平方分米？
<gadget id="calculator">48 / 2 / 4</gadget>
<output>6</output>

<gadget id="calculator">3.14 * 6 * 4</gadget>
<output>75.36</output>

<result>75.36</result>