# CBSE Class 9 Maths Revision Notes Chapter 3

## Class 9 Mathematics Revision Notes for Coordinate Geometry of Chapter 3

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## Class 9 Mathematics Revision Notes for Coordinate Geometry in Chapter 3

### Coordinate Geometry Class 9 Notes–A Short Synopsis

Extramarks provide uncomplicated access to Class 9 Mathematics Chapter 3 Notes, enabling students to efficiently review the content. Additionally, it saves the students from having to browse the internet for quality materials as these notes are written by subject matter experts. What’s more? These notes follow the updated CBSE syllabus. Therefore, students can directly access accurate and reliable notes to improve their study efforts.

### Notes of Coordinate Geometry: Topics Covered

The following subjects are covered in the Chapter 3 notes for Class 9 Mathematics:

• The Cartesian System and its associated terms
• Coordinate geometry and its definition
• Relationship between a point’s coordinates’ signs, describing the point’s location’s quadrant in more detail
• Finding the point in the plane when its coordinates are known
• Plotting of the points in the Cartesian plane

### Cartesian System

Cartesian Plane

It is described as two parallel number lines, referred to as the x-axis and y-axis. The horizontal line is the x-axis, while the vertical line is the y-axis. The coordinate axes are these lines all put together. The Cartesian plane can also be extended in all directions indefinitely.

Origin:

The origin is the location where both axes perpendicularly intersect.  Where these axes meet, right angles are formed.

The above-mentioned cartesian plane is divided into four sections or quadrants. I, II, III, and IV are the quadrants’ names, and they are arranged counterclockwise. It begins at the top right corner.

## Signs of Points In Different Coordinates in The Cartesian Plane

The following are the indications of the points positioned in the various Cartesian quadrants:

1. Quadrant I: In this quadrant, the values of both the x-coordinate and y-coordinate are positive. For example:  (+2,+3)
2. Quadrant II: In this quadrant, the value of the x-coordinate is negative while the y-coordinate is positive. For example: (-2,+3)
3. Quadrant III: In this quadrant, the values of both the x-coordinate and the y-coordinate are negative. For example: (-2,-3)
4. Quadrant IV: In this quadrant, the values of both the x-coordinate are positive while the y-coordinate are negative. For example: (+2,-3)

### Plotting of Points on a Graph

Using coordinate axes, it is simple to plot points on a given graph in the plane using an ordered number of pairs. When point A’s coordinates are given as (x,y), x denotes the abscissa and y is the ordinate.

### How to Plot a  Point on the Cartesian Plane?

The coordinate points are used to determine a point’s location in the Cartesian plane. The x-point designates the location on the horizontal axis, and the y-point designates the location on the vertical axis.

For example, point (-1,-2). The negative x-axis is 1 unit away from this point, and the negative y-axis is 2 units away from this point. Other points are plotted in the same way.

### Notes of Coordinate Geometry Class 9- How will they Help?

Coordinate geometry has a mark distribution of six marks out of the total 80 in the final examination. Usually, 2 or 3 short or long answer questions are asked in this chapter. Therefore, it is a good idea for the students to thoroughly learn and comprehend its concepts. Through the revision notes, they will be able to revise all the key points for this chapter. Students can easily and quickly learn the chapter by using a practical approach. Extramarks offers comprehensive notes that include points prepared by subject matter experts according to the revised CBSE syllabus.

### Conclusion:

One of the simpler chapters on the Class 9 syllabus is Coordinate Geometry. To help in better understanding concepts, Extramarks break down the chapter into step-by-step revision notes. Students can clearly understand the notes as they include diagrams and well-organised points to score a better understanding of the concepts. These points assist students in preparing not only for the current exams but also for the upcoming competitive exams. These Class 9 Mathematics Chapter 3 Notes are produced by subject matter experts to help students clear up their doubts and do well in tests.

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### 2. What do ordinate and abscissa mean?

An object’s distance from the y-axis is referred to as its abscissa, and its distance from the x-axis is referred to as its coordinate.

### 3. How many points can the x- and y-axes possibly intersect?

The origin is the only possible intersection of the x- and y-axes.

### 4. Write down the coordinates of the origin.

The origin’s coordinates are represented as (0,0).