A trapezoidal open space has an upper base length of 12m, a lower base length of 16m, and a height of 8m. What is the area of the land in m**2.
一块梯形的空地上底长12m，下底长16m，高8m，这块地的面积是多少m**2．
<gadget id="calculator">12 + 16</gadget>
<output>28</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">28 * 4</gadget>
<output>112</output>

<result>112</result>