After cutting a circle into an approximate rectangle, the perimeter of the rectangle is 6 cm longer than the perimeter of the circle. What is the area of the rectangle in square centimeters?
把一个圆剪拼成一个近似长方形后，长方形周长比圆的周长多6厘米，这个长方形面积为多少平方厘米．
<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>