If the circumference of a tree trunk is 125.6 cm, what is the radius of its cross section?
一棵树干的周长是125.6厘米，那么它的横截面的半径是多少．
<gadget id="calculator">125.6 / 3.14</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>