The upper base of a trapezoid is 6 cm, the lower base is 10 cm, and the height is 0.4 cm. 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厘米，它的面积是多少平方厘米．
<gadget id="calculator">6 + 10</gadget>
<output>16</output>

<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">16 * 0.2</gadget>
<output>3.2</output>

<result>3.2</result>