If the perimeter of a rectangle is 54 cm and its width is half of its length, what is the area of the rectangle in square centimeters?
一个长方形的周长54厘米，它的宽是长的一半，这个长方形的面积是多少平方厘米．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">54 / 2 / 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">18 * 9</gadget>
<output>162</output>

<result>162</result>