Cut out the largest circle in a rectangular cardboard with a circumference of 140 cm and a ratio of length to width of 4:3. What is the circumference of this circle in cm?
在一个周长为140厘米、长与宽之比为4：3的长方形纸板内剪出一个最大的圆，这个圆的周长是多少厘米？
<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">70 * (3/7)</gadget>
<output>30</output>

<gadget id="calculator">3.14 * 30</gadget>
<output>94.2</output>

<result>94.2</result>