A piece of wood that is 2 meters long and has a cross-sectional diameter of 6 centimeters, how many square centimeters does the surface area increase when it is cut into two sections?
长2米，横截面直径是6厘米的木材，平均截成2段后表面积增加了多少平方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">28.26 * 2</gadget>
<output>56.52</output>

<result>56.52</result>