A rectangular vegetable field is 7.6 meters long and 2.4 meters wide. What is the area and perimeter of the vegetable plot? (write the letter formula first, and then substitute into the calculation)
一个长方形菜地，长是7.6米，宽是2.4米．这个菜地的面积和周长各是多少？(先写字母公式，再代入计算)
<gadget id="calculator">7.6 + 2.4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>