A rectangle has the same perimeter as a square. The perimeter of the rectangle is 16 cm. What is the area of the square?
一个长方形与一个正方形周长相等，长方形的周长是16cm，正方形面积是多少？
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>