The packaging box for fluorescent tubes is a cuboid carton with square upper and lower sides. It is known that the radius of the fluorescent tube is 1.5cm and the length is 1m. What is the minimum area of cardboard required to make a packaging box?
日光灯管的包装盒是上、下两个面为正方形的长方体纸盒．已知日光灯管的半径是1.5cm，长是1m，做一个包装盒至少需要的纸板面积是多少平方分米？
<gadget id="calculator">1.5 / 10</gadget>
<output>0.15</output>

<gadget id="calculator">0.15 * 2</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 ** 2</gadget>
<output>0.09</output>

<gadget id="calculator">0.09 * 2</gadget>
<output>0.18</output>

<gadget id="calculator">0.15 * 2 * 10 * 4</gadget>
<output>12</output>

<gadget id="calculator">0.18 + 12</gadget>
<output>12.18</output>

<result>12.18</result>