The diameter of the small circle is 2 cm, the diameter of the large circle is 4 cm, and the circumference of the large circle is how many times the circumference of the small circle.
小圆的直径是2厘米，大圆的直径为4厘米，大圆的周长是小圆周长的多少倍．
<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 6.28</gadget>
<output>2</output>

<result>2</result>