trapezoidal pool has an upper base of 80 meters, a lower base of 120 meters, and a height of 50 meters. How many square meters does this pool occupy?
一个梯形的水池上底80米，下底120米，高50米，这个水池的占地面积是多少平方米？
<gadget id="calculator">80 + 120</gadget>
<output>200</output>

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

<gadget id="calculator">200 * 25</gadget>
<output>5_000</output>

<result>5_000</result>