The school band needs to make 8 cylindrical team drums. The radius of the bottom surface of the team drum is 3 decimeters, and the height is 2.5 decimeters. The upper and lower bottom surfaces are covered with sheepskin, and the sides are surrounded by aluminum skins. How many square cents of aluminum skins are needed to make these drums? rice? What about sheepskin? (connectors are ignored)
学校乐队要做8个圆柱形队鼓，队鼓底面半径是3分米，高是2.5分米，上下底面蒙的是羊皮，侧面由铝皮围成，做这些鼓至少需要铝皮多少平方分米？羊皮呢？(接头忽略不计)
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2 * 8</gadget>
<output>452.16</output>

<result>452.16</result>