There is a parallelogram cardboard, the base is 12 decimeters, and the height is half of the base. What is the area of this piece of cardboard in square decimeters?
有一个平行四边形纸板，底是12分米，高是底的一半．这块纸板的面积是多少平方分米？
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

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

<result>72</result>