The side area of a cylinder is 9.42c㎡, the height is 3cm, what is the radius of its bottom?
一个圆柱的侧面积是9.42c㎡，高是3cm，它的底面半径是多少．
<gadget id="calculator">9.42 / 3 / 3.14 / 2</gadget>
<output>0.5</output>

<result>0.5</result>