Make a cylinder with a side area of 9.42 square centimeters and a height of 3 centimeters. What is the radius of its base?
做一个圆柱体，侧面积是9.42平方厘米，高是3厘米，它的底面半径是多少．
<gadget id="calculator">9.42 / 3</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 / 3.14 / 2</gadget>
<output>0.5</output>

<result>0.5</result>