A cylinder is 12 meters high, if it is cut into 3 sections (the section is parallel to the bottom surface), its surface area is increased by 18 square decimeters, then what is the volume of this cylinder?
一个圆柱高12米，将它截成3段(截面与底面平行)，它的表面积就增加了18平方分米，则这个圆柱的体积是多少？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">18 / 4</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">12 * 10</gadget>
<output>120</output>

<gadget id="calculator">(9/2) * 120</gadget>
<output>540</output>

<result>540</result>