A cylinder has the same base perimeter and height. If the height is shortened by 4 cm, the surface area is reduced by 25.12 cm2. Find the surface area of this cylinder.
一个圆柱体底面周长和高相等．如果高缩短了4厘米，表面积就减少25.12平方厘米．求这个圆柱体的表面积．
<gadget id="calculator">6.28 * 6.28</gadget>
<output>39.4384</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 / 6.28</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">39.4384 + 6.28</gadget>
<output>45.7184</output>

<result>45.7184</result>