When deriving the formula for the area of a circle, divide the circle into several parts and put together an approximate rectangle. It is known that the perimeter of the rectangle is 6cm longer than the perimeter of the circle. What is the area of the circle in cm**2.
在推导圆的面积公式时，将圆等分成若干份，拼成一个近似的长方形，已知长方形的周长比圆的周长多6cm，这个圆的面积是多少cm**2．
<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>