There is a cone with a base diameter of 6 cm and a height of 10 cm. If you want to make a cuboid paper box with a cover so that the cone can just fit in it, how many square centimeters of hard paper will you need at least?
有一个圆锥体底面直径是6厘米，高10厘米，如果要做一个有盖的长方体纸盒，使圆锥刚好能装进去，至少需要多少平方厘米的硬纸？
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">36 + 60 + 60</gadget>
<output>156</output>

<gadget id="calculator">156 * 2</gadget>
<output>312</output>

<result>312</result>