A cylinder is rolled up from an iron sheet 30 cm long and 12 cm wide. What is the smallest cubic centimeter of space occupied by this cylinder? (π takes 3)
用一张长30厘米、宽12厘米的铁皮卷成一个圆柱，这个圆柱所占的最小空间是多少立方厘米．(π取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 * 30</gadget>
<output>360</output>

<result>360</result>