The cross section of a hydropower barrage is trapezoidal, with an upper base width of 6 meters, a lower base width of 132 meters, and a height of 20 meters. What is the cross-sectional area of the barrage of this hydropower station in square meters?
一座水电站拦河坝的横截面是梯形，上底宽6米，下底宽132米，高20米．这座水电站拦河坝的横截面的面积是多少平方米？
<gadget id="calculator">6 + 132</gadget>
<output>138</output>

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

<gadget id="calculator">138 * 10</gadget>
<output>1_380</output>

<result>1_380</result>