Physics
posted by Minte .
The sum & difference of two nonzero vectors Ä & B are equal in magnitude.what can you conclude about these vectors?why?

Sum A+B
difference=AB
maginitude sum=ABcosTheta
magnitude difference=ABcos(PITheta)
setting them equal, then cosTheta=cos(PITheta)
costheta=sinThetasinPIcosThetaCosPI
cosTheta=sinTheta+cosTheta
which makes sense only if theta is zero or PI. The vectors A,B are colinear 
PERPENDICULAR

A& B are perpendicular to each other