# Co-Ordinate Geometry Class-9 RS Aggarwal ICSE Maths Goyal Brothers

**Co-Ordinate Geometry Class-9 RS** Aggarwal ICSE Maths Goyal Brothers Prakashan Chapter-21 . We provide step by step Solutions of Exercise / lesson-21 **Co-Ordinate Geometry** for ICSE **Class-9 RS **Aggarwal Mathematics .

Our Solutions contain all type Questions with Exe-21 (A), Exe-21 (B), , Exe-21 (C), and Notes to develop skill and confidence. Visit official Website **CISCE** for detail information about ICSE Board Class-9 Mathematics.

**Co-Ordinate Geometry Class-9 RS** Aggarwal ICSE Maths Goyal Brothers Prakashan Chapter-21

**–: Select Topics :–**

**Notes on Co-Ordinate Geometry**

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 ‘O’. … These axes are called the coordinate axes

### Points on a Cartesian Plane

A pair of numbers locate points on a plane called the** coordinates**. The distance of a point from the y-axis is known as **abscissa **or x-coordinate. The distance of a point from the x-axis is called **ordinates **or y-coordinate

### The coordinates of a point

(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.

Quadrant |
Coordinate |
Sign in the quadrant |

I | (+, +) | 1st quadrant is enclosed by the positive x-axis and the positive y-axis. |

II | (-, +) | 2nd quadrant is enclosed by the negative x-axis and the positive y-axis. |

III | (-, -) | 3rd quadrant is enclosed by the negative x-axis and the negative y-axis. |

IV | (+, -) | 4th quadrant is enclosed by the positive x-axis and the negative y-axis |

### 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

**Exe-21 (A), Co-Ordinate Geometry Class-9 RS Aggarwal ICSE Maths Goyal Brothers Prakashan**

** **

**Co-Ordinate Geometry Exe-21 (B), Class-9 RS Aggarwal ICSE Maths Goyal Brothers Prakashan **

** **

**RS Aggarwal Co-Ordinate Geometry Exe-21 (C ) , Class-9 ICSE Maths Goyal Brothers Prakashan **

** **

–: End of **Co-Ordinate Geometry Class-9 RS Aggarwal** ICSE Class-9th Maths Solutions :–

Return to- RS Aggarwal Solutions for ICSE Class-9 Goyal Brothers Prakashan

Thanks