If a rectangle with a length of 9 cm and a width of 7 cm is surrounded by a wire, if it forms a square, what is the side length of the square?
用一根铁丝围成长9厘米，宽7厘米的长方形，如果围成一个正方形，这个正方形的边长是多少．
<gadget id="calculator">9 + 7</gadget>
<output>16</output>

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

<gadget id="calculator">16 * (1/2)</gadget>
<output>8</output>

<result>8</result>