There are two squares, the perimeter of the first square is 36 cm, and the perimeter of the second square is 64 cm, by how many centimeters is the side length of the first square shorter than the side of the second square?
有两个正方形，第一个正方形的周长是36厘米，第二个正方形的周长是64厘米，第一个正方形比第二个正方形的边长短多少厘米？
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<result>7</result>