Two non zero vectors vecA "and" vecB are such that |vecA+vecB|=|vecA - vecB|. Find angle between vecA "and " vecB?

Two non zero vectors vecA "and" vecB are such that |vecA+vecB|=|vecA -

1.	Two non zero vectors vecA "and" vecB are such that \|vecA+vecB\|=\|vecA - vecB\|. Find angle between vecA "and " vecB?
Answer» SOLUTION :`\|vecA+vecB\|=\|vecA-vecB\| RARR A^(2)+B^(2) +2ABcos theta=A^(2)+B^(2)-2AB cos theta` `rArr 4AB cos theta=0 rArr cos theta =0rArr theta=pi/2`