If a square with a side length of 2 cm is enlarged at a ratio of 2:1, what is the area of the square in square centimeters?
把一个边长2厘米的正方形按2：1的比放大后，这个正方形的面积是多少平方厘米
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>