Given that the sum of the two bases of the trapezoid is 1.3 meters and the height is 25 decimeters, find the area.
已知梯形两底之和是1.3米，高是25分米，求面积．
<gadget id="calculator">1.3 * 10</gadget>
<output>13</output>

<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">13 * (25/2)</gadget>
<output>325/2 = around 162.5</output>

<result>325/2 = around 162.5</result>