NCERT Solutions for Class 11 Maths Chapter 12 Introduction to Three Dimensional Geometry Ex 12.1 are part of NCERT Solutions for Class 11 Maths. Here we have given NCERT Solutions for Class 11 Maths Chapter 12 Introduction to Three Dimensional Geometry Ex 12.1.

- Introduction to Three Dimensional Geometry Class 11 Ex 12.2
- Introduction to Three Dimensional Geometry Class 11 Ex 12.3

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 11 |

Subject |
Maths |

Chapter |
Chapter 12 |

Chapter Name |
Introduction to Three Dimensional Geometry |

Exercise |
Ex 12.1 |

Number of Questions Solved |
4 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 11 Maths Chapter 12 Introduction to Three Dimensional Geometry Ex 12.1

**Ex 12.1 Class 11 Maths Question 1.**

A point is on the x-axis. What are its y-coordinate and z-coordinate?

**Solution:**

The coordinates of any point on the x-axis will be (x, 0, 0). Thus y-coordinate and z-coordinate of the point are zero.

**Ex 12.1 Class 11 Maths Question 2.**

A point is in the XZ-plane. What can you say about its y-coordinate?

**Solution:**

The coordinates of any point in XZ-plane will be (x, 0, z). Thus y-coordinate of the point is zero.

**Ex 12.1 Class 11 Maths Question 3.**

Name the octants in which the following points lie:

(1, 2, 3), (4, -2, 3), (4, -2, -5), (4, 2, -5), (-4, 2, -5), (-4, 2, 5), (-3, -1, 6), (2, -4, -7)

**Solution:**

Point (1, 2, 3) lies in Octant I.

Point (4, -2, 3) lies in Octant IV.

Point (4, -2, -5) lies in Octant VIII.

Point (4, 2, -5) lies in Octant V.

Point (- 4, 2, -5) lies in Octant VI.

Point (- 4, 2, 5) lies in Octant II.

Point (- 3, -1, 6) lies in Octant III.

Point (2, – 4, -7) lies in Octant VIII.

**Ex 12.1 Class 11 Maths Question 4.**

**Fill in the blanks:**

**(i)** The x-axis and y-axis taken together determine a plane known as ______

**(ii)** The coordinates of points in the XY-plane are of the form _______

**(iii)** Coordinate planes divide the space into ______ octants.

**Solution:**

**(i)** XY-plane

**(ii)** (x, y, 0)

**(iii)** Eight

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