What is the area of a rectangle whose perimeter is 36 cm and width is 6 cm?
一个长方形的周长是36厘米，宽是6厘米，它的面积是多少．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

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

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

<result>72</result>