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The reflection of the point (alpha,beta,...

The reflection of the point `(alpha,beta,gamma)` in the xy plane is

A

`(alpha,beta,0)`

B

`(0,0,gamma)`

C

`(-alpha,-beta,gamma)`

D

`(alpha,beta,-gamma)`

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The correct Answer is:
D
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NEW JOYTHI PUBLICATION-THREE DIMENSIONAL GEOMETRY-Objective
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  7. The vector equation of a plane which is at a distance of 6/sqrt29 from...

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  8. The equation of a plane with intercepts 2,3,and 4 on the x,y and z axe...

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  11. If the plane 2x-y+z=0 is parallel to the line (2x-1)/2=(2-y)/2 =(z+1)/...

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  12. The equation of the plane passing through (2,3,4) and parallel to the ...

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  13. The vector equation of the plane through the point (2,1,-1) and parall...

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  14. The equation of the plane passing through (1,2,3) and parallel to 3x-2...

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  15. The staight line passing through the point (1,0,-2) and perpendicular ...

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  16. Equation of the line passing through hati+hatj-3hatk and perpendicular...

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  17. The angle between a normal to the plane 2x-y+2z-1=0 and the z-axis is

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  18. Distance between the parallel planes 2x+y+2z=8 and 4x+2y+4z+5=0 is

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  19. The angle theta between the line vecr=veca+lambdavecb and the plane ve...

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  20. The reflection of the point (alpha,beta,gamma) in the xy plane is

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