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The position vectors of vertices of tria...

The position vectors of vertices of `triangle ABC` are `(1, -2), (-7,6) and (11/5, 2/5)` respectively. The measure of the interior angle A of the `triangle ABC,` is,

A

`(75^(@), 90^(@))`

B

`(60^(@), 75^(@))`

C

`(45^(@), 60^(@))`

D

`(120^(@), 150^(@))`

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The correct Answer is:
B
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