Use 4 squares with a side length of 2 cm to form a large square. What is the perimeter of this large square? (draw the puzzle)
用边长2厘米的正方形4个，拼成一个大正方形，这个大正方形的周长是多少？(画出拼图)
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

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

<result>16</result>