There are two identical cylinders, which can be assembled into a cylinder with a height of 12 cm, and the surface area is reduced by 25.12 square centimeters. Find the surface area of the original cylinder.
有两个相同的圆柱，可以拼成一个高12厘米的圆柱，表面积减少了25.12平方厘米，求原来一个圆柱的表面积．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">3.14 * 2 * 2 * 6</gadget>
<output>75.36</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">75.36 + 25.12</gadget>
<output>100.48</output>

<result>100.48</result>