Use plasticine to make a cylindrical school tool, the diameter of the bottom of the cylinder is 4 cm, and the height is 6 cm. If you make another cuboid carton so that the plasticine cylinder fits in it, how many square centimeters of hard paper do you need at least?
用橡皮泥做一个圆柱体学具，做出的圆柱底面直径4厘米，高6厘米．如果再做一个长方体纸盒，使橡皮泥圆柱正好装进去，至少需要多少平方厘米硬纸？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">16 + 24 + 24</gadget>
<output>64</output>

<gadget id="calculator">64 * 2</gadget>
<output>128</output>

<result>128</result>