If 4 squares with a perimeter of 16 cm are put together to form a large square, what is the side length of the assembled square in cm?
把4个周长都是16厘米的正方形拼成一个大正方形，拼成的正方形的边长是多少厘米．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>