The average length of the upper and lower bases of a trapezoid is 407 cm, and the height is 127 cm. What is the area of the trapezoid in square centimeters?
一个梯形的上底与下底的平均长度是407厘米，高是127厘米，这个梯形的面积是多少平方厘米．
<gadget id="calculator">127 / 2</gadget>
<output>127/2 = around 63.5</output>

<gadget id="calculator">407 * 2 * (127/2)</gadget>
<output>51_689</output>

<result>51_689</result>