What is the length of a rectangle that is 8 cm long and 4 cm long and 4 cm long by a piece of iron wire and converted into a square?
一根铁丝围成长8厘米宽4厘米的长方形，改成正方形后长是多少厘米．
<gadget id="calculator">8 + 4</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>