Cut a circle into an approximate rectangle. The length of the rectangle is 6.42 cm more than the width. What is the area of the circle in square centimeters? (π takes 3.14)
把一个圆切割拼合成一个近似的长方形，长方形的长比宽多6.42厘米，这个圆的面积是多少平方厘米．(π取3.14)
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>