Mr. Zhang’s house has a square fish pond with a side length of 20 meters. Uncle Zhang plans to build a 1-meter-wide path next to the fish pond. What is the area of this path?
张老伯家有一个边长20米的正方形鱼池．张老伯计划紧贴鱼池修一条1米宽的小路，这条小路的面积是多少？
<gadget id="calculator">20 + 1 + 1</gadget>
<output>22</output>

<gadget id="calculator">22 * 22</gadget>
<output>484</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">484 - 400</gadget>
<output>84</output>

<result>84</result>