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Let P(1,-2,5) be the foot of the perendi...

Let `P(1,-2,5)` be the foot of the perendicular drawn from the origin to the plane `pi_(1)` and the same P be the foot of the perpendicular from (1,2,-1) to the planes, `pi_(2)`. Then the acute angle between the planes `pi_(1)andpi_(2)` is

A

`cos^(-1)((19)/(sqrt(390)))`

B

`cos^(-1)((19)/(sqrt(340)))`

C

`cos^(-1)((19)/(sqrt(370)))`

D

`cos^(-1)((19)/(sqrt(350)))`

Text Solution

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The correct Answer is:
A
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