There is a vegetable field in the shape of a trapezoid, the upper base is 12 meters, the lower base is 28 meters, and the height is 50 meters. What is its area in square meters?
有一块菜地为梯形，上底是12米，下底是28米，高是50米，它面积是多少平方米？
<gadget id="calculator">12 + 28</gadget>
<output>40</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<result>1_000</result>