If a cylinder with a length of 3 meters and a volume of 12 cubic meters is divided into two parts, how many square meters will its surface area increase?
将长为3米，体积为12立方米的圆柱体据成两段，它的表面积增加了多少平方米．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>