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If hat(i)+hat(j), hat(j)+hat(k), hat(i)+...

If `hat(i)+hat(j), hat(j)+hat(k), hat(i)+hat(k)` are the position vectors of the vertices of a `Delta ABC` taken in order, then `angleA` is equal to

A

`(pi)/(2)`

B

`(pi)/(5)`

C

`(pi)/(6)`

D

`(pi)/(3)`

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The correct Answer is:
D
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