The radius of the large circle is 5 cm greater than the radius of the small circle, and the circumference of the large circle is greater than the circumference of the small circle by how many centimeters.
大圆半径比小圆半径多5厘米，大圆周长比小圆周长多多少厘米．
<gadget id="calculator">10 * 3.14</gadget>
<output>31.4</output>

<result>31.4</result>