Two squares of equal area are put together to form a rectangle. The perimeter of the square is 16 cm. What is the area of the rectangle when put together?
两个面积相等的正方形拼成1个长方形，已知正方形周长16厘米，拼成长方形面积是多少平方厘米．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 + 4</gadget>
<output>8</output>

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

<result>32</result>