A wire is 21.98 meters long and forms a circle. What is the area of the circle in square meters?
一根铁丝长21.98米，正好围成一个圆，这个圆的面积是多少平方米？
<gadget id="calculator">21.98 / 3.14 / 2</gadget>
<output>3.5</output>

<gadget id="calculator">3.5 ** 2</gadget>
<output>12.25</output>

<gadget id="calculator">3.14 * 12.25</gadget>
<output>38.465</output>

<result>38.465</result>