Facing problem in a questions on Vectors

If |vector a+vector b|= |vector a- vector b| show that vector a is perpendicular to vector b.

A friend of mine suggested me to square both the sides of the equation. At the end, the result was vector a. vector b=0, from which it could be proved that the vectors are perpendicular. But why do we use the dot product and not the cross product?

http://ift.tt/1lIYuvW

Leave a comment

Your email address will not be published.


*


Show Buttons
Hide Buttons