Two identical squares are used to form a rectangle, and its perimeter is 24 cm. What is the area of the original square in square centimeters?
用两个完全一样的正方形拼成一个长方形，它的周长是24厘米，原来一个正方形的面积是多少平方厘米．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>