The sum of the radii of the two circles is 10 meters, and the circumference of the large circle is known to be 37.68 meters, so how many meters is the circumference of the small circle?
两圆半径之和是10米，已知大圆周长是37.68米，那么小圆的周长是多少米？
<gadget id="calculator">2 * 3.14 * 4</gadget>
<output>25.12</output>

<result>25.12</result>