A square with a side length of 1 decimeter has an area of 1 square decimeter, so what is the area of a square with a side length of 3 decimeters
边长是1分米的正方形，面积是1平方分米，那么边长是3分米的正方形，面积是多少
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>