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If alpha, beta, gamma be angles which a ...

If `alpha, beta, gamma` be angles which a straighat line makes with the positive direction of the axes, then `sin^2 alpha+sin^2beta+sin^2gamma` is equal to (A) 4 (B) 1 (C) 2 (D) 3

A

2

B

3

C

4

D

None

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ML KHANNA-CO-ORDINATE GEOMETRY OF THREE DIMENSION-PROBLEM SET (1)
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  2. A parallelepiped is formed by planes drawn through the points P(6,8...

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  3. If alpha, beta, gamma be angles which a straighat line makes with the ...

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  4. A line line makes the same angle theta with each of the x and z-axes....

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  5. A line makes angles alpha,beta,gammaa n ddelta with the diagonals of a...

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  6. Which of the following triplets give the direction cosines of a line ?

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  7. The points A(1,- 6,10), B(-1, -3,4), C(5, - 1,1) and D(7,-4,7) are the...

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  8. A straight line which makes an angle of 60^@ with each of Y and Z-axis...

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

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  10. A line passes through the point (6, -7, -1) and (2, -3, 1). The direct...

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  11. If P is a point in space such that OP is inclined to OX at 45^(@) and ...

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  12. The projections of a line segment on the coordinate axes are 12,4,3 re...

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  13. The direction cosines of the line joining the points (4,3,-5) and (-2,...

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  14. If (a,b,c) and (a^('),b^('),c^(') ) are the direction ratios of two pe...

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  15. If A(6,3,2), B(5,1,4), C(3,-4,7), D(0,2,5) be from points, the project...

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  16. The angle between the lines whose direction ratios are 1,1,2,sqrt3-1,-...

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  17. The angle between the lines 2x=3y=-z and 6x=-y=-4z is

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  18. Find the angle between the lines whose direction cosines are connec...

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  19. Three lines with direction cosines (1,1,2),(sqrt(3)-1,-sqrt(3)-1,4), (...

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