Given a rectangular table with a length of 2 meters and a width of 9 decimeters and a tablecloth, what is the minimum area of the tablecloth in square decimeters?
给一张长2米，宽9分米的长方形桌子配一张桌布，桌布的面积至少是多少平方分米？
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 * 9</gadget>
<output>180</output>

<result>180</result>