Diagonals of a Quadrilateral

★ 6/10plane geometry Polarization Identity Law of Cosines vectors

Problem

A plane quadrilateral $ABCD$ has $AB = 1$ , $BC = 4$ , $CD = 2$ , $DA = 3$ . Find

\overrightarrow{AC} \cdot \overrightarrow{BD}.

Answer

Solution

Difficulty	6/10
Topics	plane geometry, Polarization Identity, Law of Cosines, vectors

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