A cylindrical granary has a length of 25.12 meters around the granary, so how many square meters does the granary occupy?
一个圆柱形的粮仓，绕粮仓走一周的长度为25.12米，那么这个粮仓的占地面积是多少平方米？
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<result>50.24</result>