A piece of cylindrical steel is 8dm in length and 10cm in diameter at the bottom. Now cut it into two cylinders with equal volumes. The sum of the surface areas of these two cylinders is greater than the original by how many cm**2.
一段圆柱形钢材，长8dm，底面直径10cm，现将它裁成体积相等的两个圆柱，这两个圆柱的表面积的和比原来多多少cm**2．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 2</gadget>
<output>157</output>

<result>157</result>