Question
Let ABCD be a parallelogram such that 
and ∠BAD be an acute angle. If 
is the vector that coincides with the altitude directed from the vertex B the side AD, then 
is given byLet ABCD be a parallelogram such that AB = q,AD = p and ∠BAD be an acute angle. If r is the vector that coincides with the altitude directed from the vertex B to the side AD, then r is given by (1)
Solution
D.
