A piece of trapezoidal glass has an upper base of 90 cm, a lower base of 160 cm, and a height of 80 cm. If you buy 20 pieces of such glass, how many square centimeters are there in total?
一块梯形玻璃，上底90厘米，下底160厘米，高80厘米，买这样的玻璃20块，一共有多少平方厘米？
<gadget id="calculator">90 + 160</gadget>
<output>250</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<gadget id="calculator">250 * 40 * 20</gadget>
<output>200_000</output>

<result>200_000</result>