Use two identical trapezoids to form a parallelogram whose base and height are 12dm, what is the area of each trapezoid in dm**2.
用两个完全一样的梯形拼成一个底和高都是12dm的平行四边形，每个梯形的面积是多少dm**2．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<result>72</result>