Putting two identical cylinders together to form a cylinder with a length of 20 cm, the surface area is reduced by 25.12 square centimeters. What is the surface area of the original cylinder?
把两个完全一样的圆柱，拼成一个长20厘米的圆柱，表面积减少了25.12平方厘米，原来一个圆柱的表面积是多少？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">3.14 * 2 * 2 * 10</gadget>
<output>125.6</output>

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

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

<gadget id="calculator">125.6 + 25.12</gadget>
<output>150.72</output>

<result>150.72</result>