If the ratio of the radius of the large circle to the radius of the small circle is 3:1, then how many times the area of the large circle is the area of the small circle.
大圆的半径与小圆半径的比是3：1，则大圆的面积是小圆的面积的多少倍．
<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<result>9</result>