The radius of the small circle is 4 cm, the radius of the large circle is 5 cm, what is the circumference of the small circle equal to the circumference of the large circle
小圆的半径是4厘米，大圆的半径是5厘米，小圆的周长是大圆周长的多少
<gadget id="calculator">2 * 3.14 * 4</gadget>
<output>25.12</output>

<gadget id="calculator">2 * 3.14 * 5</gadget>
<output>31.4</output>

<gadget id="calculator">25.12 / 31.4</gadget>
<output>0.8</output>

<result>0.8</result>