Straighten a rectangular wire frame with a length of 8 cm and a width of 4 cm, and use this wire to form a square. What is the side length of this square in cm?
把一个长8厘米，宽4厘米的长方形铁丝框架拉直，用这根铁丝围成一个正方形，这个正方形的边长是多少厘米？
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

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

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

<result>6</result>