4 squares with a side length of 3 meters are put together to form a large square. What is the perimeter of this large square in meters?
把4个边长3米的正方形拼成一个大正方形，这个大正方形的周长是多少米？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>