There is a small square with a side length of 1.5 decimeters. If such 4 small squares are used to form a large square, what is the area of the large square?
有一小正方形边长1.5分米，如果用这样的4块小正方形拼成一个大正方形，大正方形的面积是多少？
<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>