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Question

ABCDEF is a regular hexagon. If ^AB=^a and ^BC=^b then the other sides are represented by the vectors

A
^CD=^a^b,^DE=^a,^EF=^b,^FA=^a+^b
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B
^CD=^a+^b,^DE=^b,^EF=^a,^FA=^b^a
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C
^CD=^b^a,^DE=^a,^EF=^b,^FA=^a^b
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D
^CD=2^b^a,^DE=^b,^EF=^a,^FA=^a^b
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Solution

The correct option is D ^CD=^b^a,^DE=^a,^EF=^b,^FA=^a^b
|a|=|b|
AD||BC
So AD=kb
|AD|=2|b|
k=2
AD=AB+BC+CD
2b=a+b+cd
ba=CD
DE=AB
DE=a
EF=BC
EF=b
CD=FA
ab=FA
54372_36069_ans.JPG

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