circular flower bed with a diameter of 10 meters is enlarged to a diameter of 16 meters. How many square meters has the floor area of the flower bed increased?
一个圆形花坛，直径为10米，经过扩建，直径增加到16米，花坛占地面积增加了多少平方米？
<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">64 - 25</gadget>
<output>39</output>

<gadget id="calculator">3.14 * 39</gadget>
<output>122.46</output>

<result>122.46</result>