Divide a parallelogram with a base of 12 cm and a height of 6 cm into two identical trapezoids, what is the area of each trapezoid in square centimeters?
把一个底是12厘米，高是6厘米的平行四边形分成2个完全一样的梯形，每个梯形的面积是多少平方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>