If a cylinder with a diameter of 36 cm and a length of 9 decimeters is cut into 3 sections of equal length, how many square centimeters is the surface area increased?
把一根直径为36厘米，长为9分米的圆柱形截成长短一样的3段，表面积增加了多少平方厘米．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 ** 2</gadget>
<output>324</output>

<gadget id="calculator">3.14 * 324 * 4</gadget>
<output>4_069.44</output>

<result>4_069.44</result>