The surface area of a cylinder is equal to the area of a rectangle, and the length of the rectangle is equal to the circumference of the base of the cylinder. It is known that the area of the rectangle is 251.2 square centimeters, and the radius of the base of the cylinder is 2 cm. What is the height of the cylinder in centimeters?
一个圆柱体的表面积和长方形的面积相等，长方形的长等于圆柱体的底面周长，已知长方形的面积是251.2平方厘米，圆柱体的底面半径是2厘米．圆柱体的高是多少厘米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">251.2 - 25.12</gadget>
<output>226.08</output>

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

<gadget id="calculator">226.08 / 12.56</gadget>
<output>18</output>

<result>18</result>