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## Homework Statement

Prove that Vector A is perpendicular to Vector B if |VectorA + VectorB| = |VectorA-VectorB| and use this to prove that the angle formed by joining any point on a circle to the end points of a diameter is 90 degrees,

## Homework Equations

## The Attempt at a Solution

I really have no idea where to begin, i no that VectorA (dot) VectorB=0 for them to be perpendicular but i still dont really understand the second part of the problem, if somebody could point me in the right direction that would be appreciated thank you