A circle is formed by a wire with a radius of exactly 6 cm. If the wire is surrounded by a square, what is the length of each side in cm?
把一根铁丝围成一个圆，半径正好是6cm．如果把这根铁丝围成一个正方形，边长是多少cm．
<gadget id="calculator">2 * 3.14 * 6</gadget>
<output>37.68</output>

<gadget id="calculator">37.68 / 4</gadget>
<output>9.42</output>

<result>9.42</result>