CBSE Class 9 Maths Notes Chapter 6 Coordinate Geometry Pdf free download is part of Class 9 Maths Notes for Quick Revision. Here we have given NCERT Class 9 Maths Notes Chapter 6 Coordinate Geometry. https://www.cbselabs.com/coordinate-geometry-class-9-notes/

## CBSE Class 9 Maths Notes Chapter 6 Coordinate Geometry

Coordinate Geometry Class 9 Notes Chapter 6

1. Cartesian System: The system used to describe the position of a point in a plane is called the cartesian system.
In a cartesian system, there are two perpendicular lines and a point is located by referring them. The horizontal line XX’ is called X-axis and vertical line YY’ is called Y-axis.

The point where these lines intersect each other is called origin and is denoted by â€˜Oâ€™. OX and OY are called positive directions while OX’ and OY’ are called negative directions. These axes divide the plane into four parts.

These four parts are called the quadrants (one-fourth part) numbered I, II, III and IV anti-clockwise from OX. So, the plane consists of these axes and these quadrants are called the cartesian plane or the coordinate plane or the XY-plane. These axes are called the coordinate axes.

Coordinate Geometry Notes Class 9 Chapter 6

The coordinates of a point are written by using the following conventions
(i) The x-coordinate of a point is its perpendicular distance from the Y-axis measured along the X-axis (positive along the positive direction of the X-axis and negative along the negative direction of the X-axis). The x-coordinate is also called the abscissa.

(ii) The Y-coordinates of a point is its perpendicular distance from the X-axis measured along the Y-axis (positive along the positive direction of the Y-axis and negative along the negative direction of the Y-axis). The Y-coordinate is also called the ordinate.
(iii) In stating the coordinates of a point in the coordinate plane, the x-coordinate comes first and then the Y-coordinate. We place the coordinates in brackets.

Coordinate Geometry Class 9 Notes Pdf Chapter 6

2. The relationship between the Signs of the Coordinates of a Point and the Quadrant in which It Lies

(i) If a point is in the 1st quadrant, then the point will be in the form (+, +), since the 1st quadrant is enclosed by the positive X-axis and the positive Y-axis.

(ii) If a point is in the Ilnd quadrant, then the point will be in the form (-, +), since the Ilnd quadrant is enclosed by the negative X-axis and the positive Y-axis.

(iii) If a point is in the Illrd quadrant, then the point will be in the form (-, -), since the Illrd quadrant is enclosed by the negative X-axis and the negative Y-axis.

(iv) If a point is in the IVth quadrant, then the point will be in the form (+, -), since the IVth quadrant is enclosed by the positive X-axis and the negative Y-axis (see figure).

Note: The coordinates of origin O are (0, 0) because it has zero distance from both the axes, so its abscissa and ordinate both are zero.

We hope the given CBSE Class 9 Maths Notes Chapter 6 Coordinate Geometry Pdf free download will help you. If you have any query regarding NCERT Class 9 Maths Notes Chapter 6 Coordinate Geometry, drop a comment below and we will get back to you at the earliest.