If a cylinder of wood with a base diameter of 6 decimeters and a height of 4 decimeters is cut into two small cylinders, how many square decimeters will the surface area increase?
一个底面直径6分米、高4分米的圆柱体木料，如果切成两个小圆柱体，表面积增加了多少平方分米？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<result>56.52</result>