The sum of the upper and lower bases of a trapezoid is 1.5 meters and the height is 0.4 meters. What is its area in square meters?
一个梯形的上底与下底的和是1.5米，高为0.4米，它的面积是多少平方米．
<gadget id="calculator">0.4 / 2</gadget>
<output>0.2</output>

<gadget id="calculator">1.5 * 0.2</gadget>
<output>0.3</output>

<result>0.3</result>