The diameter of the large circle is three times the radius of the small circle. If the area of the large circle is 36 square centimeters, what is the area of the small circle?
大圆的直径是小圆半径的3倍，如果大圆面积是36平方厘米，那么小圆的面积是多少？
<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<result>4</result>