After combining three squares of the same size into a rectangle, the perimeter of the rectangle is reduced by 28 centimeters from the sum of the perimeters of the original three squares. What is the area of each square in square centimeters?
把大小一样的三个正方形拼成一个长方形后，长方形的周长比原来三个正方形周长总和减少了28厘米，原来每个正方形的面积是多少平方厘米．
<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<result>49</result>