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A tetrahedron has vertices of O(0, 0, 0)...

A tetrahedron has vertices of `O(0, 0, 0), A(1, 2, 1), B(2, 1, 3) and C(-1, 1, 2)`. Then, the angle between the faces OAB and ABC will be

A

`cos^(-1)((19)/(35))`

B

`cos^(-1)((17)/(31))`

C

`30^(@)`

D

`90^(@)`

Text Solution

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The correct Answer is:
(a)
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ARIHANT MATHS-THREE DIMENSIONAL COORDINATE SYSTEM-Exercise (Single Option Correct Type Questions)
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  9. Through a point P(h,k,l) a plane is drawn at righat angle to OP to mee...

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  14. Let P(3, 2, 6) be a point in space and Q be a point on line vecr= (hat...

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  15. A plane makes intercepts OA, OB and OC whose measurements are b and c ...

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  16. The radius of the circle in which the sphere x^(2)=y^(2)+z^(2)+2z-2y-4...

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  17. Let veca=hati+hatj and vecb=2hati-hatk. Then the point of intersection...

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  18. The coordinates of the point P on the line vec r=( hat i+ hat j+ ha...

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  19. Find 3-dimensional vectors vec v1,vec v2,vec v3 satisfying vec v1* ve...

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