The windshield of a car is trapezoidal, the upper base is 80 cm long, the lower base is 19 cm longer than the upper base, and the height is 50 cm. Find the area of the windshield.
一块汽车的挡风玻璃是梯形的，上底长80厘米，下底比上底长19厘米，高50厘米．求这块挡风玻璃的面积．
<gadget id="calculator">80 + 19</gadget>
<output>99</output>

<gadget id="calculator">80 + 99</gadget>
<output>179</output>

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

<gadget id="calculator">179 * 25</gadget>
<output>4_475</output>

<result>4_475</result>