A circular flower bed has a diameter of 1.6 meters. What is the area of the flower bed in square meters?
一个圆形花坛的直径为1.6米．则这个花坛的面积为多少平方米．
<gadget id="calculator">1.6 / 2</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 ** 2</gadget>
<output>0.64</output>

<gadget id="calculator">3.14 * 0.64</gadget>
<output>2.0096</output>

<result>2.0096</result>