A circle is cut into a rectangle and the circumference is increased by 6 cm; then, what is the area of the circle in square centimeters?
一个圆切割后拼成长方形，周长增加了6厘米；那么，这个圆的面积是多少平方厘米．
<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>