If the ratio of the radius of the large circle to the radius of the small circle is 4:1, then how many times the area of the large circle is the area of the small circle.
若大圆半径与小圆半径的比是4：1，则大圆的面积是小圆面积的多少倍．
<gadget id="calculator">16 / 1</gadget>
<output>16</output>

<result>16</result>