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The reflection of the point P (alpha, be...

The reflection of the point `P (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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ICSE-THREE DIMENSIONAL GEOMETRY-MULTIPLE CHOICE QUESTIONS
  1. If the direction cosines of a line are lt k, k, kgt then

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  2. If a line is equally inclined with the coordinate axes, then its direc...

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

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  4. O is the origin and P is point at a distance of 3 units from origin. ...

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  5. P is a point on the line segment joining the points (3,2,-1) and (6,2,...

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  6. If the direction angles of a line are alpha, beta and gamma respective...

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  7. If a line makes angles (pi)/(3) and (pi)/(4) with the x-axis and y-axi...

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  8. The acute angle between the planes 2x-y+z=5 and x+y +2z =7 is

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  9. The equation of the plane which cuts equal intercepts of unit length o...

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  10. The distance of the plane overset(to) (r ) ((2)/(7) hat(i) + (3)/(7) h...

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  11. If the plane 2x-3y+6z=11 makes an angle sin^(-1) (alpha) with the x-ax...

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  12. The sine of the angle between the line (x-2)/(3) = (y-3)/(4) = (z-4)/(...

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  13. The distance between the planes 2x+2y-z+2=0 and 4x+4y-2z+5=0 is

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  14. The angle between the lines overset(to)( r)=(4 hat(i) - hat(j) )+ lamb...

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  15. If the line (x-1)/(-3) = (y-2)/(2k) = (z-3)/( 2) and (x-1)/( 3k) = (y-...

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  16. If a plane cuts intercepts of lengths 8,4 and4 units on the coordinate...

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  17. The angle between the lines (x+4)/(1) = (y-3)/(2) = (z+2)/(3) and (x)/...

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  18. If a line makes an angle of pi/4 with the positive directions of each ...

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  19. If the planes x+2y+kz=5 and 2x +y-2z=0 are at right angles, then the v...

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  20. The ratio in which the line segment joining the points (-2,4,5) and (3...

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