The sum of the radius, diameter and circumference of a circle is 9.28dm, what is the area of the circle in dm**2.
一个圆的半径、直径、周长三者之和是9.28dm，这个圆的面积是多少dm**2．
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>