The upper base of a trapezoid is 0.8 decimeters, the lower base is 1.2 decimeters, and the height is 10 decimeters. What is its area in decimeters?
一个梯形的上底是0.8分米，下底是1.2分米，高是10分米，它的面积是多少分米．
<gadget id="calculator">0.8 + 1.2</gadget>
<output>2</output>

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

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

<result>10</result>