Vector And Basic Maths

Question 1

Projection

Answer 1

A cos○ or A vector • B vector / B
( scalar)
(A vector dot B vector / B) B cap
( vector form)

Question 2

Coplaner

Answer 2

First do vector product of two vector given , then dot product the result with third vector given ,
If results is zero , then the given vectors are coplaner .