The perimeter of a square table is 16 decimeters, what is the area of 4 such square tables?
一张方桌面的周长是16分米，4张这样的方桌面的面积是多少．
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 4 * 4</gadget>
<output>64</output>

<result>64</result>