The radius of the large circle is three times the radius of the small circle, and the area of the large circle is 84.78 square centimeters. What is the area of the small circle in square centimeters?
大圆半径是小圆半径的3倍，大圆面积是84.78平方厘米，则小圆面积为多少平方厘米．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">84.78 / 9</gadget>
<output>9.42</output>

<result>9.42</result>