A circular flower bed with a radius of 6 meters is paved with a 2-meter-wide pebble road outside it, find the area of the pebble road.
一个半径为6米的圆形花坛，在它的外边铺一条2米宽的卵石路，求卵石路的面积．
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

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

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

<gadget id="calculator">64 - 36</gadget>
<output>28</output>

<gadget id="calculator">3.14 * 28</gadget>
<output>87.92</output>

<result>87.92</result>