A ribbon can form a rectangle with a length of 10 cm and a width of 4 cm. If the ribbon is used to form a square, what is the side length of the square?
一条彩带可以围成一个长10厘米，宽4厘米的长方形，如果用这条彩带围成一个正方形，那么正方形的边长是多少厘米？
<gadget id="calculator">10 + 4</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<result>7</result>