If the length of a rectangle is 10 cm and the width is 6 cm, what is its perimeter in cm?
一个长方形的长是10厘米，宽是6厘米，它的周长是多少厘米．
<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>