Put the circle into an approximate rectangle, and the circumference is increased by 6 cm. What is the area of the circle in square centimeters (π takes 3.14).
把圆拼成一个近似的长方形，周长增加了6厘米，这个圆的面积是多少平方厘米(π取3.14)．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<result>28.26</result>