The upper base, lower base, and height of a trapezoid are 5cm, 9cm, and 6cm respectively. What is the area in square decimeters?
一个梯形的上底、下底、高分别是5cm、9cm、6cm，面积是多少平方分米．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">6 / 2 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">14 * (3/100)</gadget>
<output>21/50 = around 0.42</output>

<result>21/50 = around 0.42</result>