The upper base of a trapezoid is 8 cm, the lower base is 14 cm, and the height is the same as the upper base. What is its area in square centimeters?
一个梯形上底是8厘米，下底是14厘米，高与上底相同，它的面积是多少平方厘米．
<gadget id="calculator">8 + 14</gadget>
<output>22</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">22 * 4</gadget>
<output>88</output>

<result>88</result>