Xiao Ming sits on the lantern by himself, welds an 84 cm long iron wire into a cube frame, and wraps red paper around it. How many square centimeters of red paper do you need at least?
小明自己动手坐灯笼，用一根长84厘米的铁丝焊接成一个正方体框架，在四周围上红纸，至少需要多少平方厘米红纸？
<gadget id="calculator">84 / 12</gadget>
<output>7</output>

<gadget id="calculator">7 * 7 * 6</gadget>
<output>294</output>

<result>294</result>