(1) S梯形=(AB+CD)·H/2
=(2+7)×3√2/2
=27√2/2
(2) 将梯形ABCD向下平移3√2个单位长度后,写出此时梯形各个顶点的坐标如下:
A(2,0) B(4,0) C(7,﹣3√2) D(0,﹣3√2)