If a circular flower bed with a radius of 4 meters is divided into 4 parts on average, and one of them is planted with tulips, how many square meters will the tulips occupy?
把一个半径为4米的圆形花坛平均分成4块，其中一块种郁金香，那么郁金香占地多少平方米．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<result>12.56</result>