There is a piece of grass 20 meters long and 10 meters wide, and a 1-meter-wide path is built around it. Find the area of the path.
有一块长20米，宽10米的草地，在它的四周向外修一条1米宽小路，求小路面积．
<gadget id="calculator">10 + 1 + 1</gadget>
<output>12</output>

<gadget id="calculator">20 + 1 + 1</gadget>
<output>22</output>

<gadget id="calculator">12 * 22</gadget>
<output>264</output>

<gadget id="calculator">10 * 20</gadget>
<output>200</output>

<gadget id="calculator">264 - 200</gadget>
<output>64</output>

<result>64</result>