Question

Vector resolute
A) prove that the diagonals of a square are perpendicular.

B) find the angle at which the diagonals of a cube intersect

Answer 1

based on theorem two vector are equivalent if and only if their corresponding component are equal.

Answer 2

I'm not good with vectors, but maybe I could help you out with part (A).
When are two vectors perpendicular?

Answer 3

can you write a b and c vectors