The lateral area of a cylinder is 188.4 square decimeters, and the radius of the base is 2 decimeters. What is its height in decimeters.
一个圆柱的侧面积是188.4平方分米，底面半径是2分米．它的高是多少分米．
<gadget id="calculator">188.4 / 3.14 / 2 / 2</gadget>
<output>15</output>

<result>15</result>