ABCDE is a pentagon. Forces \[\overrightarrow{AB},\,\overrightarrow{AE},\,\overrightarrow{DC},\,\overrightarrow{ED}\] act at a point. Which force should be added to this system to make the resultant \[{{\cos }^{-1}}\frac{4}{5}\] [MNR 1984]

ABCDE is a pentagon. Forces \[\overrightarrow{AB},\,\overrightarrow{AE

1.	ABCDE is a pentagon. Forces \[\overrightarrow{AB},\,\overrightarrow{AE},\,\overrightarrow{DC},\,\overrightarrow{ED}\] act at a point. Which force should be added to this system to make the resultant \[{{\cos }^{-1}}\frac{4}{5}\] [MNR 1984]
A.	\[\overrightarrow{AC}\]
B.	\[\overrightarrow{AD}\]
C.	\[\overrightarrow{BC}\]
D.	\[\overrightarrow{BD}\]
Answer» D. \[\overrightarrow{BD}\]

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ABCDE is a pentagon. Forces \[\overrightarrow{AB},\,\overrightarrow{AE},\,\overrightarrow{DC},\,\overrightarrow{ED}\] act at a point. Which force should be added to this system to make the resultant \[{{\cos }^{-1}}\frac{4}{5}\] [MNR 1984]

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