The upper base of a trapezoid is 6 cm, the lower base is 14 cm, and the height is 5 cm. What is the area in square centimeters?
一个梯形的上底是6厘米，下底是14厘米，高是5厘米，面积是多少平方厘米？
<gadget id="calculator">6 + 14</gadget>
<output>20</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">20 * (5/2)</gadget>
<output>50</output>

<result>50</result>