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If OA is equally inclined to OX,OY ,OZ a...

If OA is equally inclined to OX,OY ,OZ and if A is `sqrt(3)` units from the origin then the cordinates of A are

A

`(3,3,3)`

B

`(-1,1,-1)`

C

`(-1,1,1)`

D

`(1,1,1)`

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The correct Answer is:
To solve the problem, we need to find the coordinates of point A given that OA is equally inclined to the OX, OY, and OZ axes, and that the distance OA is \(\sqrt{3}\) units from the origin. ### Step-by-Step Solution: 1. **Understanding the Angles**: - Since OA is equally inclined to the OX, OY, and OZ axes, let the angle made with each axis be \(\alpha\). Therefore, we have: \[ \alpha = \beta = \gamma \] 2. **Using the Cosine Rule**: - According to the cosine rule in three dimensions, we have: \[ \cos^2 \alpha + \cos^2 \beta + \cos^2 \gamma = 1 \] - Substituting \(\alpha = \beta = \gamma\), we get: \[ \cos^2 \alpha + \cos^2 \alpha + \cos^2 \alpha = 1 \] \[ 3 \cos^2 \alpha = 1 \] 3. **Solving for \(\cos \alpha\)**: - Dividing both sides by 3: \[ \cos^2 \alpha = \frac{1}{3} \] - Taking the square root: \[ \cos \alpha = \frac{1}{\sqrt{3}} \] 4. **Finding the Coordinates**: - The coordinates of point A can be expressed in terms of the distance OA and the cosine of the angles: \[ A = (OA \cos \alpha, OA \cos \beta, OA \cos \gamma) \] - Since \(OA = \sqrt{3}\) and \(\cos \alpha = \cos \beta = \cos \gamma = \frac{1}{\sqrt{3}}\): \[ A = \left(\sqrt{3} \cdot \frac{1}{\sqrt{3}}, \sqrt{3} \cdot \frac{1}{\sqrt{3}}, \sqrt{3} \cdot \frac{1}{\sqrt{3}}\right) \] - Simplifying this gives: \[ A = (1, 1, 1) \] 5. **Conclusion**: - Therefore, the coordinates of point A are: \[ A = (1, 1, 1) \] ### Final Answer: The coordinates of point A are \((1, 1, 1)\).

To solve the problem, we need to find the coordinates of point A given that OA is equally inclined to the OX, OY, and OZ axes, and that the distance OA is \(\sqrt{3}\) units from the origin. ### Step-by-Step Solution: 1. **Understanding the Angles**: - Since OA is equally inclined to the OX, OY, and OZ axes, let the angle made with each axis be \(\alpha\). Therefore, we have: \[ \alpha = \beta = \gamma ...
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OBJECTIVE RD SHARMA ENGLISH-THREE DIMENSIONAL COORDINATE SYSTEM -Exercise
  1. If OA is equally inclined to OX,OY ,OZ and if A is sqrt(3) units from ...

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  2. If the x-coordinate of a point P on the join of Q(2,2,1)a n dR(5,1,-...

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  3. The distance of the point P(a,b,c) from the x-axis is

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  4. Ratio in which the xy-plane divides the join of (1, 2, 3) and (4, 2...

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  5. If P (3,2,−4) , Q (5,4,−6) and R (9,8,−10)  are collinear, then  ...

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  6. A (3,2,0) , B (5,3,2)C (-9,6,-3) are three points forming a triangle. ...

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  7. A line passes through the points (6,-7,-1)a n d(2,-3,1)dot Find te ...

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  8. If a line makes angles alpha,beta,gamma with the positive direction of...

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  9. If P is a point in space such that OP=12 and vec(OP) is inclied at ang...

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  10. A vector vec O P is inclined to O X at 45^0 and O Y at 60^0 . Find th...

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  11. vector is equal inclined with the coordinate axes. If the tip ofvecr ...

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  12. If vecr is a vector of magnitude 21 and has direction ratios 2, -3 an...

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  13. The direction cosines of the lines bisecting the angle between the lin...

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  14. Find the coordinates of the foot of the perpendicular drawn from po...

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

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  16. If P(x,y,z) is a point on the line segment joining Q(2,2,4) and R(3,5,...

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  17. If O is the origin, OP = 3, with direction ratios -1, 2 and -2, then f...

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  18. A mirror and a source of light are situated at the origin O and at a p...

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  19. Find the angle between any two diagonals of a cube.

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  20. A line makes angles angle, beta, gamma and delta with the diagonals of...

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  21. If P(0,1,2),\ Q(4,-2,1)a n d\ O(0,0,0) are three points then P O Q= ...

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