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Coordinate Geometry Class 9th Notes - Free NCERT Class 9th Maths Chapter 3 Notes - Download PDF

Coordinate Geometry Class 9th Notes - Free NCERT Class 9th Maths Chapter 3 Notes - Download PDF

Edited By Ramraj Saini | Updated on Apr 21, 2022 02:15 PM IST

Coordinate Geometry class 9 notes:

Coordinate Geometry is the NCERT chapter that deals with the cartesian plane. The NCERT Class 9 Maths Chapter 3 Notes also contain important formulas. Coordinate geometry class 9 notes containing systematic explanations of topics using examples and exercises. Class 9 maths chapter 3 notes include FAQ’s or frequently asked questions about the chapter. CBSE class 9 maths chapter 9 notes can also be downloaded from Coordinate System class 9 notes pdf download.

This Story also Contains
  1. Coordinate Geometry class 9 notes:
  2. Coordinate Geometry class 9 notes:
  3. Quadrants of the Cartesian Plane
  4. Coordinates of a Point
  5. Plotting a Point in the Plane when Coordinates are given
  6. Significance of NCERT class 9 maths chapter 3 notes

Also, students can refer,

Coordinate Geometry class 9 notes:

Cartesian System

Let’s take two number lines, a horizontal and a vertical line. The horizontal axis is called the x-axis and the vertical axis is called the y-axis. It is known as the cartesian system.

1648015273154

  • In the above graph, the x-axis is the horizontal line y-axis is the vertical line.

  • At the origin, the x-axis and y-axis intersect each other. It is represented by ‘O’.

Quadrants of the Cartesian Plane

The Cartesian plane is split into four quadrants called Quadrant I, II, III, and IV.

1648015281027

Coordinates of a Point

Rules :-

  • The X-coordinate of a point is marked by forming a perpendicular line from the y-axis measured length of the x-axis. It is also known as the Abscissa.

  • The Y-coordinate of a point is marked by forming a perpendicular line from the x-axis measured length of the y-axis. It is also known as the Ordinate.

  • Coordinates are written inside the bracket with x-coordinate written first followed by-coordinates.

1648015272792

In the above figure,

  • OB=CA=x coordinate (Abscissa), and

  • CO=AB=y coordinate (Ordinate).

Coordinate is written as (x, y).

At the origin O, both the x-axis and y-axis values are zero. Then the coordinate of the origin is (0, 0).

  • The relationship between the signs of the coordinates of a point and the quadrant of a point.

Quadrant

Coordinate

Sign in the quadrant

I

(+, +)

1st quadrant has the positive x-axis and the positive y-axis.

II

(-, +)

2nd quadrant has the negative x-axis and the positive y-axis.

III

(-, -)

3rd quadrant has the negative x-axis and the negative y-axis.

IV

(+, -)

4th quadrant has positive x-axis and the negative y-axis

Plotting a Point in the Plane when Coordinates are given

Plotting a Point in the Plane if its Coordinates are Given

Steps to plot the point (2, 3) on a Cartesian plane -

  • Draw the Cartesian plane by drawing the coordinate axes with the scale 1unit=1cm

  • x-coordinates are marked from 0 to the right side in the positive x-axis and mark 2 with a scale of 1 unit.

  • y-coordinates are marked from 0 to upwards in the positive direction and mark 3 at a scale of 1 unit.

  • Thus, the point is the coordinate (2, 3).

Significance of NCERT class 9 maths chapter 3 notes

Coordinate Geometry class 9th notes will help students to understand the formulas, statements, and rules in detail. This NCERT class 9 maths chapter 3 notes also contains previous year’s questions and NCERT textbook pdf.

In offline mode, Class 9 maths chapter 3 notes pdf download/Coordinate Geometry class 9 notes pdf download can be used to prepare.

NCERT Class 9 Notes Chapter wise

NCERT solutions of class 9 subject wise

NCERT Class 9 Exemplar Solutions for Other Subjects:

Frequently Asked Question (FAQs)

1. Which coordinate is called the vertical point in the coordinate graph?

According to class 9th maths chapter 3 notes:

y-coordinate is called the vertical point in the coordinate graph.

2. What is the weightage of class 9 Coordinate Geometry notes for the board exam?

Students can expect 3 to 6 marks questions from the notes for class 9 maths chapter 3.

3. Is the coordinates (x, y) = (y, x)?

As given in the notes for class 9 maths chapter 3, if 

  • x ≠ y,

  • then (x, y) ≠ (y, x), and

  • (x, y) = (y, x), where  x = y.

4. What is abscissa ?

According to NCERT notes for class 9 maths chapter 3, abscissa is the x-axis

5. What is Ordinate?

It’s given in notes for class 9 maths chapter 3 that the ordinate is the y-axis.

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