A rectangular vegetable field is 6 meters long and 3 meters wide. If one side is against a wall, how many meters is the minimum required for the fence?
一块长方形菜地，长6米，宽3米．如果一面靠墙，至少需要篱笆多少米？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<result>12</result>