The diameter of the large circle is 12.56 meters, the radius of the small circle is 3.14 meters, how many times the area of the large circle is the small circle.
大圆直径是12.56米，小圆半径是3.14米，大圆面积是小圆的多少倍．
<gadget id="calculator">6.28 * 6.28</gadget>
<output>39.4384</output>

<gadget id="calculator">3.14 * 3.14</gadget>
<output>9.8596</output>

<gadget id="calculator">39.4384 / 9.8596</gadget>
<output>4</output>

<result>4</result>