The surface area of a cylinder is 50.24 square decimeters, and the radius of the base is 2 decimeters. What is the height of the cylinder?
一个圆柱的表面积是50.24平方分米，底面半径是2分米，则这个圆柱的高是多少分米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">2 * 12.56</gadget>
<output>25.12</output>

<gadget id="calculator">50.24 - 25.12</gadget>
<output>25.12</output>

<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">25.12 / 12.56</gadget>
<output>2</output>

<result>2</result>