The upper base of a trapezoid is 5 decimeters, the lower base is 5.6 decimeters, and the height is 0.4 decimeters. What is its area in square decimeters?
一个梯形的上底是5分米，下底是5.6分米，高是0.4分米，它的面积是多少平方分米．
<gadget id="calculator">5 + 5.6</gadget>
<output>10.6</output>

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

<gadget id="calculator">10.6 * 0.2</gadget>
<output>2.12</output>

<result>2.12</result>