flower bed with a diameter of 12 meters, if a circular stone road with a width of 1 meter is built on the outside, find the area of the road.
一个直径为12米的花坛，如果在外侧修一条1米宽的环形石子路，求路的面积．
<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>