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Measure of angle between the planes bar(...

Measure of angle between the planes `bar(r ).(3i+j-k)=1` and `barr.(i+4j-2k)=2` is

A

`cos^(-1)(9/sqrt(231))`

B

`cos^(-1)(4/sqrt(231))`

C

`cos^(-1)(11/sqrt(231))`

D

`sin^(-1)(4/sqrt(231))`

Text Solution

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The correct Answer is:
A
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MARVEL PUBLICATION-PLANE IN SPACE -PART B: MASTERING THE BEST ON LINE AND PLANE IN SPACE
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