piece of cylindrical wood with a length of 40 cm is sawn off a small piece with a length of 10 cm, and the surface area is reduced by 62.8 square centimeters. Find the surface area of the original cylindrical wood.
一段长40厘米的圆柱体木料，锯下10厘米长的一小段，表面积减少了62.8平方厘米，求原来圆柱体木料的表面积．
<gadget id="calculator">62.8 / 10</gadget>
<output>6.28</output>

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

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

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

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

<gadget id="calculator">6.28 * 40</gadget>
<output>251.2</output>

<gadget id="calculator">6.28 + 251.2</gadget>
<output>257.48</output>

<result>257.48</result>