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Please solve RD Sharma class 12 chapter 22 Algebra of Vectors exercise Multiple choice question 13 maths textbook solution

Answers (1)

Answer: 4 \overrightarrow{A B}                                             

Hint: Find \overrightarrow{A D}+\overrightarrow{E B}+\overrightarrow{F C}  equals - ?                                                                             

Given: If ABCDEF is regular Hexagon then \overrightarrow{A D}+\overrightarrow{E B}+\overrightarrow{F C}                                                    

Answer: We have

\begin{aligned} &\overrightarrow{A D}+\overrightarrow{E B}+\overrightarrow{F C} \\ \\ &(\overrightarrow{A B}+\overrightarrow{B C}+\overrightarrow{C D})+(\overrightarrow{E D}+\overrightarrow{D C}+\overrightarrow{C B})+\overrightarrow{F C} \end{aligned}

\begin{gathered} \overrightarrow{A B}+(\overrightarrow{B C}+\overrightarrow{C B})+(\overrightarrow{C D}+\overrightarrow{D C})+\overrightarrow{E D}+\overrightarrow{F C} \\ \\ \overrightarrow{A B}+\overrightarrow{0}+\overrightarrow{0}+\overrightarrow{A B}+2 \overrightarrow{A B}=4 \overrightarrow{A B} \\ \\ \left(\begin{array}{l} \overrightarrow{E D}=\overrightarrow{A B}, \\ \\ \overrightarrow{F C}=2 \overrightarrow{A B} \end{array}\right) \end{gathered}

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