After unfolding a cylinder from the side, a square with a perimeter of 125.6 cm is obtained. What is the radius of the base of this cylinder in cm?
把一个圆柱从侧面展开后，得到一个周长是125.6cm的正方形，这个圆柱的底面半径是多少cm．
<gadget id="calculator">125.6 / 4</gadget>
<output>31.4</output>

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

<result>5</result>