The radius of a circular flower bed is 4 meters, and it is divided into 4 parts on average, and the area of one part is used to plant rose flowers. How many square meters is the area of rose flower?
一个圆形花坛的半径是4米，把它平均分成4份，其中一份的面积用来种月季花．月季花的面积是多少平方米？
<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>