Use 36 cm long iron wire to form a rectangle. It is known that the ratio of width to length of this rectangle is 1:2. What is the area of this rectangle in square centimeters?
用36厘米长的铁丝围成一个长方形，已知这长方形的宽与长的比是1：2，求这长方形的面积是多少平方厘米？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">18 * (2/3)</gadget>
<output>12</output>

<gadget id="calculator">18 - 12</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>