cylinder is surrounded by a square piece of paper with a side length of 12cm. What is the volume of the cylinder in cm**3. (π≈3)
用边长是12cm的正方形纸片围成一个圆柱，圆柱的体积是多少cm**3．(π≈3)
<gadget id="calculator">12 / 3 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 * 4 * 12</gadget>
<output>144</output>

<result>144</result>