Let be unit vectors such that . Which one of the following is correct?
are mutually perpendicular vectors.
⇒ Unit vectors represent three sides of a triangle taken in order
⇒ Triangle is equilateral.
Proceeding as in illustration 14, we get
A unit vector making an obtuse angle with x-axis and perpendicular to the plane containing the points also makes an obtuse angle with
is a unit vector such that
then a unit vector normal to the vectors
A unit vector perpendicular to both
If are the position vectors of the vertices A, B, C of a triangleABC, then the area of triangle ABC is
If , then the length of the perpendicular from A to the line BC is
The perpendicular distance of the point from the line joining
If the diagonals of a parallelogram are represented by the vectors , then its area in square units is
If are three vectors such that then
Let be a unit vector perpendicular to unit vectors and if the angle between is α, then is