Question

如图,在空间直角坐标系中有长方体ABCD-A′B′C′D′,AB=1,BC=2,AA′=3

Answer 1

这个长方体画得真歪.

AC' = OC' = (1,2,3)

BD' = OD' - OB = (0,2,3) - (1,0,0) = (-1,2,3)

AD' = OD' = (0,2,3)