If the side of a cylinder is unfolded, it is a square with a side length of 9.42 cm. What is the diameter of the base of this cylinder?
把一个圆柱的侧面展开，是一个边长9.42cm的正方形，这个圆柱的底面直径是多少．
<gadget id="calculator">9.42 / 3.14</gadget>
<output>3</output>

<result>3</result>