The upper base of a trapezoid is 12 cm, the lower base is 10 cm, and the height is 6 cm. What is the area in square centimeters?
一个梯形的上底是12厘米，下底是10厘米，高是6厘米，面积是多少平方厘米．
<gadget id="calculator">12 + 10</gadget>
<output>22</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">22 * 3</gadget>
<output>66</output>

<result>66</result>