Two cylinders with the same base area, cylinder A is 2 cm higher than cylinder B, and the surface area is 94.2 cm2 larger, what is the diameter of the bottom of cylinder B in cm?
底面积相等的两个圆柱体，甲圆柱比乙圆柱高2厘米，表面积大94.2平方厘米，乙圆柱的底面直径是多少厘米．
<gadget id="calculator">94.2 / 2 / 3.14</gadget>
<output>15</output>

<result>15</result>