After unfolding the side of a cylinder, a rectangle is obtained. The length of the rectangle is 12.56 cm and the width is 6.28 cm. What is the radius of the bottom of this cylinder in cm?
把一个圆柱的侧面展开后，得到一个长方形，长方形的长是12.56厘米，宽是6.28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">12.56 / 6.28</gadget>
<output>2</output>

<result>2</result>