The upper base of a trapezoid is 6 cm, the lower base is 10 cm, and the height is 0.4 decimeters. What is its area in square centimeters?
一个梯形的上底是6厘米，下底是10厘米，高是0.4分米，它的面积是多少平方厘米．
<gadget id="calculator">6 + 10</gadget>
<output>16</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">16 * 0.4 * 5</gadget>
<output>32</output>

<result>32</result>