There is a trapezoidal flowerbed, the upper base is 15 meters, the lower base is 25 meters, and the height is 22 meters. What is the area of the garden in square meters?
有一块梯形的花圃，上底是15米，下底是25米，高是22米．这块花圃的面积是多少平方米？
<gadget id="calculator">15 + 25</gadget>
<output>40</output>

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

<gadget id="calculator">40 * 11</gadget>
<output>440</output>

<result>440</result>