If \( A B C D \) is quadrilateral and \( E \) and \( F \) are the mid-points of \( A C \) and \(... VIDEO
If \( A B C D \) is quadrilateral and \( E \) and \( F \) are the mid-points of \( A C \) and \( B D \), prove that
\[
\overrightarrow{\mathrm{AB}}+\overrightarrow{\mathbf{A D}}+\overrightarrow{\mathbf{C B}}+\overrightarrow{\mathrm{CD}}=4 \overrightarrow{\mathrm{EF}}
\]
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