If the base of a parallelogram is 0.8 decimeters long and twice its height, what is its area in square decimeters?
一个平行四边形的底长0.8分米，是高的2倍，它的面积是多少平方分米．
<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">0.8 * 0.4</gadget>
<output>0.32</output>

<result>0.32</result>