If the width of a rectangle increases by 4 centimeters, the area increases by 52 square centimeters, which is exactly a square. What is the area of the original rectangle in square centimeters?
一个长方形的宽若增加4厘米，则面积增加52平方厘米，这时恰好是一个正方形．求原来长方形的面积是多少平方厘米？
<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<gadget id="calculator">13 - 4</gadget>
<output>9</output>

<gadget id="calculator">13 * 9</gadget>
<output>117</output>

<result>117</result>