Cut a piece of parallelogram paper with a base length of 6 cm and a height of 4 cm into two identical trapezoids. What is the area of each trapezoid in square centimeters?
把一张底边长6厘米，高4厘米的平行四边形纸片剪成两个完全一样的梯形，每个梯形的面积是多少平方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<result>12</result>