To celebrate New Year's Day, the school specially made a banner with a length of 9 meters and a width of 2 meters. What is the circumference of this banner?
学校为欢庆元旦，专门制作了一张长9米，宽2米的横幅，那么此横幅周长为多少？
<gadget id="calculator">9 + 2</gadget>
<output>11</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<result>22</result>