The side length of a small square is 3 cm, and the side length of a large square is 4 times the side length of the small square. What is the area of the large square?
一个小正方形的边长是3厘米，一个大正方形的边长是小正方形边长的4倍，大正方形的面积是多少？
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>