The bottom of a boiler is circular with a diameter of 3.2 meters. What is the area of the bottom of the boiler in square meters?
一个锅炉的底面是圆形，直径是3.2米，这个锅炉底面的面积是多少平方米？
<gadget id="calculator">3.2 / 2</gadget>
<output>1.6</output>

<gadget id="calculator">1.6 ** 2</gadget>
<output>2.56</output>

<gadget id="calculator">3.14 * 2.56</gadget>
<output>8.0384</output>

<result>8.0384</result>