If a square with a perimeter of 16 cm is equally divided into two rectangles, what is the area of one of the rectangles?
把一个周长是16cm的正方形平均分成两个长方形，其中一个长方形的面积是多少．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

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

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

<result>8</result>