If the length of a rectangle is 6 cm and its width is 4 cm, what is the perimeter of the rectangle?
一个长方形长是6厘米，比宽长4厘米，这个长方形的周长是多少厘米．
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>