The side length of a square tabletop is 9 decimeters. If a tablecloth is placed on the tabletop and each side is required to sag by 2 decimeters, what is the area of the tablecloth in square decimeters?
一张方形桌面的边长是9分米，如果给桌面配一块桌布，并要求四周各下垂2分米，这块桌布的面积是多少平方分米？
<gadget id="calculator">9 + 2 + 2</gadget>
<output>13</output>

<gadget id="calculator">13 * 13</gadget>
<output>169</output>

<result>169</result>