What is the condition for two vectors are orthogonal ?

The two vectors are orthogonal,if

When do we say two vectors are orthogonal?

What is the condition that two non-zero vectors are (a) orhtogonal and (b) collinera?

What is the condition for parallelism of two vectors ?

Find the condition for two vectors to be (i) paraiiel.

What is the condition for perpendicularity of two vectors ?

What is the vector product of two equal vectors ?

What is the essential condition for addition of two vectors?

vec(A) and vec(B) are two vectors having the same magnitude . What is the condition that (i) the vector sum vec(A)+vec(B) and (ii) the vector differece vec(A) + vec(B) have the same magnitude as vec(A) and vec(B) ?

What is vector product of two vectors ? Give two examples .