The upper base of the trapezoid is 8 meters, the lower base is 10.2 meters, and the height is 4 meters. What is the area of the trapezoid in square meters?
梯形的上底是8米，下底是10.2米，高是4米，这个梯形的面积是多少平方米．
<gadget id="calculator">8 + 10.2</gadget>
<output>18.2</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">18.2 * 2</gadget>
<output>36.4</output>

<result>36.4</result>