The diameter of the circular dance floor in People's Square is 6 meters, what is its area in square meters?
人民广场圆形舞池的直径是6米，它的面积是多少平方米？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>