The perimeter of a rectangle is 28 centimeters. If the length of the rectangle is reduced by 1 centimeter and the width is increased by 2 centimeters, it becomes a square. What is the area of the square in square centimeters?
一个长方形的周长是28厘米，如果这个长方形的长减少1厘米，宽增加2厘米，就成为一个正方形，则这个正方形的面积是多少平方厘米．
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">1 + 14 + 2</gadget>
<output>17</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">17 / 2</gadget>
<output>17/2 = around 8.5</output>

<gadget id="calculator">(17/2) - 1</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) * (15/2)</gadget>
<output>225/4 = around 56.25</output>

<result>225/4 = around 56.25</result>