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If the vertices of a triangle A, B, C a...

If the vertices of a triangle A, B, C are A(0, 0), B(2, 1), C(9, -2) then cosB =

A

`(16)/(5sqrt(17))`

B

`(11)/(sqrt(290))`

C

`(16)/(5sqrt(7))`

D

`(-11)/(sqrt(290))`

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The correct Answer is:
D
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DIPTI PUBLICATION ( AP EAMET)-COORDINATE SYSTEM (2D) -EXERCISE 27
  1. If the vertices of a triangle A, B, C are A(0, 0), B(2, 1), C(9, -2) ...

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