Fold a rectangle in half to get a square. The perimeter of the square is 16 cm. What is the area of the original rectangle in square centimeters?
把一个长方形对折后得到一个正方形，这个正方形的周长是16厘米，原来长方形的面积是多少平方厘米．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

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

<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<result>32</result>