When two cylinders with base circumferences of 8πcm are glued together to form a long cylinder, how many square centimeters does the surface area of the cylinder decrease?
两个底面周长都是8π厘米的圆柱体粘连成一个长圆柱体后，圆柱的表面积减少了多少平方厘米？
<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>