After unfolding the sides of a cylinder, a square with a side length of 31.4 cm is exactly obtained. What is the radius of the base of this cylinder in centimeters?
一个圆柱的侧面展开后，正好得到一个边长31.4厘米的正方形，这个圆柱的底面半径是多少厘米．
<gadget id="calculator">31.4 / 3.14 / 2</gadget>
<output>5</output>

<result>5</result>