English

The vector equation of the line passing through the points (3, 5, 4) and (5, 8, 11) is rijkijkr→=3i^+5j^+4k^+λ(2i^+3j^+7k^)

Advertisements
Advertisements

Question

The vector equation of the line passing through the points (3, 5, 4) and (5, 8, 11) is `vec"r" = 3hat"i" + 5hat"j" + 4hat"k" + lambda(2hat"i" + 3hat"j" + 7hat"k")`

Options

  • True

  • False

MCQ
True or False
Advertisements

Solution

This statement is True.

Explanation:

The position vector of the points (3, 5, 4) and (5, 8, 11) are `vec"a" = 3hat"i" + 5hat"j" + 4hat"k", vec"b" = 5hat"i" + 8hat"j" + 11hat"k"`

Therefore, the required equation of the line is given by

`vec"r" = 3hat"i" + 5hat"j" + 4hat"k" + lambda(2hat"i" + 3hat"j" + 7hat"k")`

shaalaa.com
  Is there an error in this question or solution?
Chapter 11: Three Dimensional Geometry - Solved Examples [Page 234]

APPEARS IN

NCERT Exemplar Mathematics Exemplar [English] Class 12
Chapter 11 Three Dimensional Geometry
Solved Examples | Q 24 | Page 234

RELATED QUESTIONS

Find the direction cosines of the line perpendicular to the lines whose direction ratios are -2, 1,-1 and -3, - 4, 1 


Which of the following represents direction cosines of the line :

(a)`0,1/sqrt2,1/2`

(b)`0,-sqrt3/2,1/sqrt2`

(c)`0,sqrt3/2,1/2`

(d)`1/2,1/2,1/2`


If the lines `(x-1)/(-3) = (y -2)/(2k) = (z-3)/2 and (x-1)/(3k) = (y-1)/1 = (z -6)/(-5)` are perpendicular, find the value of k.


Find the vector equation of the plane passing through (1, 2, 3) and perpendicular to the plane `vecr.(hati + 2hatj -5hatk) + 9 = 0`


If a line has direction ratios 2, −1, −2, determine its direction cosines.


Find the direction cosines of the sides of the triangle whose vertices are (3, 5, −4), (−1, 1, 2) and (−5, −5, −2).


Find the angle between the vectors whose direction cosines are proportional to 2, 3, −6 and 3, −4, 5.


Show that the points (2, 3, 4), (−1, −2, 1), (5, 8, 7) are collinear.


Show that the line through points (4, 7, 8) and (2, 3, 4) is parallel to the line through the points (−1, −2, 1) and (1, 2, 5).


Find the angle between the lines whose direction ratios are proportional to abc and b − cc − aa− b.


Write the ratio in which YZ-plane divides the segment joining P (−2, 5, 9) and Q (3, −2, 4).


A line makes an angle of 60° with each of X-axis and Y-axis. Find the acute angle made by the line with Z-axis.


Write the ratio in which the line segment joining (abc) and (−a, −c, −b) is divided by the xy-plane.


Write the coordinates of the projection of the point P (2, −3, 5) on Y-axis.


Find the distance of the point (2, 3, 4) from the x-axis.


Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
Write the distance of a point P(abc) from x-axis.


A rectangular parallelopiped is formed by planes drawn through the points (5, 7, 9) and (2, 3, 7) parallel to the coordinate planes. The length of an edge of this rectangular parallelopiped is


If the x-coordinate of a point P on the join of Q (2, 2, 1) and R (5, 1, −2) is 4, then its z-coordinate is


The distance of the point P (abc) from the x-axis is 


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


Find the direction cosines of the line joining the points P(4,3,-5) and Q(-2,1,-8) . 


Verify whether the following ratios are direction cosines of some vector or not

`4/3, 0, 3/4`


Find the direction cosines and direction ratios for the following vector

`5hat"i" - 3hat"j" - 48hat"k"`


Choose the correct alternative:
The unit vector parallel to the resultant of the vectors `hat"i" + hat"j" - hat"k"` and `hat"i" - 2hat"j" + hat"k"` is


If the direction ratios of a line are 1, 1, 2, find the direction cosines of the line.


If a line makes an angle of 30°, 60°, 90° with the positive direction of x, y, z-axes, respectively, then find its direction cosines.


If α, β, γ are the angles that a line makes with the positive direction of x, y, z axis, respectively, then the direction cosines of the line are ______.


If a line makes angles α, β, γ with the positive directions of the coordinate axes, then the value of sin2α + sin2β + sin2γ is ______.


If the directions cosines of a line are k,k,k, then ______.


The area of the quadrilateral ABCD, where A(0,4,1), B(2, 3, –1), C(4, 5, 0) and D(2, 6, 2), is equal to ______.


The co-ordinates of the point where the line joining the points (2, –3, 1), (3, –4, –5) cuts the plane 2x + y + z = 7 are ______.


The d.c's of a line whose direction ratios are 2, 3, –6, are ______.


A line passes through the points (6, –7, –1) and (2, –3, 1). The direction cosines of the line so directed that the angle made by it with positive direction of x-axis is acute, are ______.


A line in the 3-dimensional space makes an angle θ `(0 < θ ≤ π/2)` with both the x and y axes. Then the set of all values of θ is the interval ______.


The projections of a vector on the three coordinate axis are 6, –3, 2 respectively. The direction cosines of the vector are ______.


Equation of a line passing through point (1, 2, 3) and equally inclined to the coordinate axis, is ______.


Which identity must be satisfied by the direction cosines \[(l,m,n)\] of a line?


A line passes through \[P(x_1,y_1,z_1)\] and \[Q(x_2,y_2,z_2)\]. Which is one set of direction ratios of the line?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×