The perimeter of a rectangle is 140 cm, and the ratio of length to width is 4:3. Draw the largest circle inside this rectangle. What is the area of the circle in square centimeters?
一个长方形的周长是140厘米，长与宽的比是4：3，在这个长方形里面画出一个最大的圆，画出的圆面积是多少平方厘米？
<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">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225</gadget>
<output>706.5</output>

<result>706.5</result>