The length of the rectangle is 3 cm, the width is 2 cm, what is the perimeter in cm?
长方形的长是3厘米，宽是2厘米，周长是多少厘米．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>