Mom uses a 20.56-meter-long bamboo fence to form a closed semi-circular chicken coop. What is the area of the chicken coop in square meters?
妈妈用20.56米长的竹篱笆围成一个封闭式半圆形鸡舍，这个鸡舍的面积是多少平方米？
<gadget id="calculator">20.56 / 5.14</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>