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【简答题】
在矩形ABCD中，AB=6cm，BC=12cm，点P从点A出发，沿AB边B以1cm/秒的速度移动，同时，点Q从点B出发沿BC边C以2cm/秒的速度移动．如果P、Q两点在分别到达B、C两点后就停止移动，回答下列问题： （1）运动开始后第几秒时，△PBQ的面积等于8cm 2 ？ （2）设运动开始后第t秒时，五边形APQCD的面积为Scm 2 ，写出S与t的函数关系式，并指出自变量t的取值范围；写出t为何值时，s的值最小． （3）当t= 3 2 时，试判断△DPQ的形状． （4）计算四边形DPBQ的面积，并探索一个与计算结果有关的结论．
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