Question

Vector Calculus:
Let c be a non-zero scalar and let A be a non-zero vector and let u be a unit vector such that A * u = 0. Let O be a fixed reference point:

Answer 1

A*u=A.u?

Answer 2

(A) Give a geometrical description of the set of all points whose position vectors satisfy the equation R * A = c.

(B) Give a geometrical description of the set of all points whose position vectors satisfy the equation R x u = A.