The sum of the upper and lower bases of a trapezoid is 14cm, the height is 4.8cm, what is the area in cm**2.
一个梯形上底和下底的和是14cm，高是4.8cm，面积是多少cm**2．
<gadget id="calculator">4.8 / 2</gadget>
<output>2.4</output>

<gadget id="calculator">14 * 2.4</gadget>
<output>33.6</output>

<result>33.6</result>