Two identical cylinders can be put together to form a cylinder with a height of 10 cm, but the surface area is reduced by 6.28 square centimeters. What is the surface area of a cylinder in square centimeters?
两个完全一样的圆柱，能拼成一个高10厘米的圆柱，但表面积减少了6.28平方厘米，原来一个圆柱的表面积是多少平方厘米．
<gadget id="calculator">6.28 / 2</gadget>
<output>3.14</output>

<gadget id="calculator">3.14 / 3.14</gadget>
<output>1</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 1 * 1 * 2 * 5</gadget>
<output>31.4</output>

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

<gadget id="calculator">31.4 + 6.28</gadget>
<output>37.68</output>

<result>37.68</result>