The upper base of a trapezoid is 2.5 decimeters, the lower base is 3.5 decimeters, and the height is 1.2 decimeters. What is its area?
一个梯形的上底是2.5分米，下底3.5分米，高是1.2分米，它的面积是多少平方分米．
<gadget id="calculator">2.5 + 3.5</gadget>
<output>6</output>

<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">6 * 0.6</gadget>
<output>3.6</output>

<result>3.6</result>