After unfolding the side of a cylinder, a rectangle is obtained. The length of the long fractal is 6.28 cm and the width is 3.14 cm. What is the radius of the bottom surface of this cylinder in centimeters.
把一个圆柱体的侧面展开后，得到一个长方形，长分形的长是6.28厘米，宽是3.14厘米，这个圆柱体的底面半径是多少厘米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 / 6.28</gadget>
<output>1</output>

<result>1</result>