🗑️ 🧵 Help i dont get vectors
Anonymous at Tue, 19 Mar 2024 17:10:04 UTC No. 16086745
>This is a perfect cube
>AB=u
>AD=v
>AA'=w
How do i prove that CA' is perpendicular to BC'D?
Anonymous at Tue, 19 Mar 2024 17:12:45 UTC No. 16086746
Like planes don't work with my brain...
I know i should do the whole V1•V2=0 thing for 2 vectors but how do planes function?
elipo at Tue, 19 Mar 2024 18:27:20 UTC No. 16086847
>>16086745
so basically, you do the scalar product of A'C with two of the vectors in the DBC' plane, and you end up finding 0 as a result for both, so if A'C is perpendicular to two non-parallel vectors defining the plane, then it is perpendicular to the plane
Anonymous at Tue, 19 Mar 2024 18:44:10 UTC No. 16086864
>>16086745
take the cross product of BD and BC' and then check that the result is a multiple of CA'
Anonymous at Tue, 19 Mar 2024 19:58:32 UTC No. 16086965
>>16086745
>homework thread