Solution of Chapter 11. Three Dimensional Geometry (Mathematics Part-II Book)

If a line makes angles 90°, 135°, 45° with the x, y and z-axes respectively, find its direction cosines.

Find the direction cosines of a line which makes equal angles with the coordinate axes.

If a line has the direction ratios –18, 12, –4, then what are its direction cosines?

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

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

Show that the three lines with direction cosines are mutually perpendicular.

Show that the line through the points (1, –1, 2), (3, 4, –2) is perpendicular to the line through the points (0, 3, 2) and (3, 5, 6).

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

Find the equation of the line which passes through the point (1, 2, 3) and is parallel to the vector

Find the equation of the line in vector and in cartesian form that passes through the point with position vector and is in the direction

Find the cartesian equation of the line which passes through the point (–2, 4, –5) and parallel to the line given by

The Cartesian equation of a line is . Write its vector form.

Find the vector and the cartesian equations of the lines that passes through the origin and (5, –2, 3).

. Find the vector and the cartesian equations of the line that passes through the points (3, –2, –5), (3, –2, 6).

Find the angle between the following pairs of lines:

. Find the angle between the following pair of lines:

Find the values of p so that the lines are at right angles.

Show that the lines are perpendicular to each other.

Find the shortest distance between the lines

Find the shortest distance between the lines

Find the shortest distance between the lines whose vector equations are

Find the shortest distance between the lines whose vector equations are

In each of the following cases, determine the direction cosines of the normal to the plane and the distance from the origin.

z = 2

In each of the following cases, determine the direction cosines of the normal to the plane and the distance from the origin.

x + y + z = 1

In each of the following cases, determine the direction cosines of the normal to the plane and the distance from the origin.

2x + 3y – z = 5

In each of the following cases, determine the direction cosines of the normal to the plane and the distance from the origin.

5y + 8 = 0

Find the vector equation of a plane which is at a distance of 7 units from the origin and normal to the vector

Find the Cartesian equation of the following planes:

Find the Cartesian equation of the following planes:

Find the Cartesian equation of the following planes:

In the following cases, find the coordinates of the foot of the perpendicular drawn from the origin.

2x + 3y + 4z – 12 = 0

In the following cases, find the coordinates of the foot of the perpendicular drawn from the origin.

2x + 3y + 4z – 12 = 0

In the following cases, find the coordinates of the foot of the perpendicular drawn from the origin.

3y + 4z – 6 = 0

In the following cases, find the coordinates of the foot of the perpendicular drawn from the origin.

x + y + z = 1

Find the vector and cartesian equations of the planes

that passes through the point (1, 0, –2) and the normal to the plane is

Find the vector and cartesian equations of the planes

that passes through the point (1,4, 6) and the normal vector to the plane is

Find the equations of the planes that passes through three points.

(1, 1, –1), (6, 4, –5), (–4, –2, 3)

Find the equations of the planes that passes through three points.

(1, 1, 0), (1, 2, 1), (–2, 2, –1)

Find the intercepts cut off by the plane 2x + y – z = 5.

Find the equation of the plane with intercept 3 on the y-axis and parallel to ZOX plane.

Find the equation of the plane through the intersection of the planes 3x – y + 2z – 4 = 0 and x + y + z – 2 = 0 and the point (2, 2, 1).

Find the vector equation of the plane passing through the intersection of the planes and through the point (2, 1, 3).

Find the equation of the plane through the line of intersection of the planes x + y + z = 1 and 2x + 3y + 4z = 5 which is perpendicular to the plane x – y + z = 0.

Find the angle between the planes whose vector equations are

In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them.

7x + 5y + 6z + 30 = 0 and 3x – y – 10z + 4 = 0

In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them.

2x + y + 3z – 2 = 0 and x – 2y + 5 = 0

In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them.

2x – 2y + 4z + 5 = 0 and 3x – 3y + 6z – 1 = 0

In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them.

2x – 2y + 4z + 5 = 0 and 3x – 3y + 6z – 1 = 0

In the following cases, determine whether the given planes are parallel or perpendicular, and in case they are neither, find the angles between them.

4x + 8y + z – 8 = 0 and y + z – 4 = 0

In the following cases, find the distance of each of the given points from the corresponding given plane.

Point Plane

(0, 0, 0) 3x – 4y + 12 z = 3

In the following cases, find the distance of each of the given points from the corresponding given plane.

Point Plane

(3, – 2, 1) 2x – y + 2z + 3 = 0

In the following cases, find the distance of each of the given points from the corresponding given plane.

Point Plane

(2, 3, – 5) x + 2y – 2z = 9

In the following cases, find the distance of each of the given points from the corresponding given plane.

Point Plane

(–6, 0, 0) 2x – 3y + 6z – 2 = 0

Show that the line joining the origin to the point (2, 1, 1) is perpendicular to the line determined by the points (3, 5, –1), (4, 3, –1).

If l₁, m₁, n₁ and l₂, m₂, n₂ are the direction cosines of two mutually perpendicular lines, show that the direction cosines of the line perpendicular to both of these are (m₁n₂ - m₂n₁), (n₁l₂ - n₂l₁), (l₁m₂ - l₂m₁)

Find the angle between the lines whose direction ratios are a, b, c and b – c, c – a, a – b.

Find the equation of a line parallel to x - axis and passing through the origin.

If the coordinates of the points A, B, C, D be (1, 2, 3), (4, 5, 7), (–4, 3, –6) and (2, 9, 2) respectively, then find the angle between the lines AB and CD.

If the lines and are perpendicular, find the value of k.

Find the vector equation of the line passing through (1, 2, 3) and perpendicular to the plane .

Find the equation of the plane passing through (a, b, c) and parallel to the plane .

Find the shortest distance between lines

and .

Find the coordinates of the point where the line through (5, 1, 6) and (3, 4,1) crosses the YZ - plane.

Find the coordinates of the point where the line through (5, 1, 6) and (3, 4, 1) crosses the ZX - plane.

Find the coordinates of the point where the line through (3, –4, –5) and (2, –3, 1) crosses the plane 2x + y + z = 7.

Find the equation of the plane passing through the point (–1, 3, 2) and perpendicular to each of the planes x + 2y + 3z = 5 and 3x + 3y + z = 0.

If the points (1, 1, p) and (–3, 0, 1) be equidistant from the plane , then find the value of p.

Find the equation of the plane passing through the line of intersection of the planes and and parallel to x-axis.

If O be the origin and the coordinates of P be (1, 2, –3), then find the equation of the plane passing through P and perpendicular to OP.

Find the equation of the plane which contains the line of intersection of the planes and . And which is perpendicular to the plane .

Find the distance of the point (–1, –5, –10) from the point of intersection of the line and the plane .

Find the vector equation of the line passing through (1, 2, 3) and parallel to the planes s and .

Find the vector equation of the line passing through the point (1, 2, – 4) and perpendicular to the two lines:

and .

Prove that if a plane has the intercepts a, b, c and is at a distance of p units from the origin, then

Distance between the two planes: 2x + 3y + 4z = 4 and 4x + 6y + 8z = 12 is

The planes: 2x – y + 4z = 5 and 5x – 2.5y + 10z = 6 are