After cutting a cylinder with a height of 10dm into two cylinders, the surface area increases by 6.28dm**2. What is the original surface area in dm**2?
把一个高是10dm的圆柱截成两个圆柱后，表面积就增加了6.28dm**2，原来的表面积是多少dm**2．
<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">3.14 * 1 * 1 * 2 * 10</gadget>
<output>62.8</output>

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

<gadget id="calculator">62.8 + 6.28</gadget>
<output>69.08</output>

<result>69.08</result>