There is a circular flower bed in the park with a diameter of 12 meters. Now the radius is widened by 1 meter. How much does it increase from the original area?
公园有一个圆形花坛，直径12米，现在半径加宽1米，比原来的面积增加多少？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">3.14 * 49</gadget>
<output>153.86</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<gadget id="calculator">153.86 - 113.04</gadget>
<output>40.82</output>

<result>40.82</result>