Use a 64 cm long iron wire to form a square, and paste white paper on it, at least how many square centimeters of paper are needed.
用一根长64厘米的铁丝围成一个正方形，在它上面糊白纸，至少需要多少平方厘米的纸．
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<gadget id="calculator">16 * 16</gadget>
<output>256</output>

<result>256</result>