Naughty can just use a piece of wire to form a rectangle with a length of 9 cm and a width of 5 cm, and there is nothing left. Later, this wire was used to form a square. What is the side length of the square in centimeters?
淘气用一根铁丝恰好能够围成一个长是9厘米、宽是5厘米的长方形，没有剩余．后来又用这根铁丝围成了一个正方形，正方形的边长是多少厘米？
<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">14 * (1/2)</gadget>
<output>7</output>

<result>7</result>