A rectangular board is twice as long as it is wide, and its circumference is 54 cm. What is the area of this rectangular board in square centimeters?
一块长方形木板，长是宽的2倍，周长是54厘米．这个长方形木板的面积是多少平方厘米．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<gadget id="calculator">54 / 6</gadget>
<output>9</output>

<gadget id="calculator">2 * 9 * 9</gadget>
<output>162</output>

<result>162</result>