A square plank is 64 cm long on all sides, what is the area of the plank in square centimeters
一块正方形木板四周长64厘米，木板的面积是多少平方厘米
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

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

<result>256</result>