A square garden has a side length of 18 meters. It is necessary to plant green grass around it and reclaim 2 meters outward along its circumference. How many square meters is the total area at this time?
一个正方形花园，边长为18米，要在它的四周种上绿草，沿着它的四周向外开垦出2米，这时总面积是多少平方米？
<gadget id="calculator">18 + 2</gadget>
<output>20</output>

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

<result>400</result>