The circumference of a circle is 12.56 cm. If the radius of the circle is enlarged by 10 times, what is the circumference in cm?
一个圆的周长是12.56厘米，如果把圆的半径扩大10倍，那么周长是多少厘米．
<gadget id="calculator">12.56 * 10</gadget>
<output>125.6</output>

<result>125.6</result>