The upper base of a trapezoid is 10cm, the lower base is 1.2dm, and the height is 0.5dm. What is the area of the trapezoid in cm**2.
一个梯形的上底是10cm，下底是1.2dm，高是0.5dm，这个梯形的面积是多少cm**2．
<gadget id="calculator">1.2 * 10</gadget>
<output>12</output>

<gadget id="calculator">10 + 12</gadget>
<output>22</output>

<gadget id="calculator">0.5 * 10</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">22 * (5/2)</gadget>
<output>55</output>

<result>55</result>