A square is formed from 3 identical rectangles, and the perimeter is reduced by 48 cm. Find the area of each rectangle?
由3个完全相同的长方形拼成一个正方形，周长减少了48厘米，求每个长方形的面积？
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>