Roll a rectangular piece of paper with a length of 6 decimeters and a width of 3 decimeters into a cylinder, and put the cylinder upright on the table, what is its maximum volume in cubic decimeters? (π takes 3)
把一张长6分米，宽3分米的长方形纸片卷成一个圆柱，并把这个圆柱直立在桌面上，它的最大体积是多少立方分米．(π取3)
<gadget id="calculator">6 / 3 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3 * 1 * 3</gadget>
<output>9</output>

<result>9</result>