If a cylinder with a base radius of 4 decimeters is cut into two cylinders, the surface area of the two cylinders will be larger than the original by how many square decimeters.
一个底面半径4分米的圆柱截成两个圆柱体后，两个圆柱表面积比原来多多少平方分米．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<result>100.48</result>