NCERT Solutions for Class 12 Maths Chapter 11 Three Dimensional Geometry — Exercise 11.1

ncert class 12 maths chapter 11 Three Dimensional Geometry

Question 1:If a line makes angles 90°, 135°, 45° with the x, y and z-axes respectively, find its direction cosines.

exercise 11.1 maths class 12 Chapter 11 Three Dimensional Geometry

Question 2:Find the direction cosines of a line which makes equal angles with the coordinate axes.

cbse class 12 maths ncert solutions Chapter 11

Question 3:If a line has the direction ratios –18, 12, – 4, then what are its direction cosines ?

Class 12 maths solutions Three Dimensional Geometry

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

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