The area of a rectangle is 18 square centimeters and the length is 6 centimeters. What is the perimeter of the rectangle in centimeters?
一个长方形的面积是18平方厘米，长是6厘米，这个长方形的周长是多少厘米．
<gadget id="calculator">18 / 6</gadget>
<output>3</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

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

<result>18</result>