A piece of iron wire can make a rectangle with a length of 20 cm and a width of 8 cm. If this wire is used to make a square, what is the side length of the square in cm?
一根铁丝能做一个长20厘米，宽8厘米的长方形，如果用这根铁丝做一个正方形，那么这个正方形的边长应是多少厘米．
<gadget id="calculator">20 + 8</gadget>
<output>28</output>

<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<result>14</result>