A, B, C and D are four points in space

MATHEMATICS · Subjective · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

A, B, C and D are four points in space. Using vector methods, prove that AC2+BD2+AD2+BC2≥AB2+CD2AC^2 + BD^2 + AD^2 + BC^2 \ge AB^2 + CD^2 what is the implication of the sign of equality.

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