CBSE class 9 Maths Chapter 1 Orienting Yourself: The Use of Coordinates is very interesting chapter. Math can be nightmare for some students as it contains complex formula, diagram and involves critical thinking. But some students also enjoy solving complex math problem.
In The Use of Coordinates Notes students will learn about the x-axis, y-axis, origin, quadrants, ordered pairs, plot and identify points, reflection of points and distance between two points. These concepts will strength the concept and prepare students for upcoming exam.
Orienting Yourself: The Use of Coordinates Notes
Class 9 Maths Chapter 1 Orienting Yourself :The Use of Coordinates Notes will help the students to revise the chapter faster and solve real problem. Diagram, chart and graph has given in notes for better understanding the concepts.
Important Topics
1. Two perpendicular number lines intersecting at point zero are called coordinate axes. The horizontal number line is the x-axis (denoted by X′OX) and the vertical one is the y-axis (denoted by Y′OY). The point of intersection of x-axis and y-axis is called origin and denoted by ‘O’.
2. Cartesian plane is a plane obtained by putting the coordinate axes perpendicular to each other in the plane. It is also called coordinate plane or xy plane.
3. The x-coordinate of a point is its perpendicular distance from y-axis.
4. The y-coordinate of a point is its perpendicular distance from x-axis.
5. The point where the x axis and the y axis intersect is represented by coordinate points (0, 0) and is called the origin.
6. The abscissa of a point is the x-coordinate of the point. The ordinate of a point is the y-coordinate of the point.
7. If the abscissa of a point is x and the ordinate of the point is y, then (x, y) are called the coordinates of the point.
8. The axes divide the Cartesian plane into four parts called the quadrants (one fourth part), numbered I, II, III and IV anticlockwise from OX.
9. Sign of coordinates depicts the quadrant in which it lies. The coordinates of a point are of the form (+, +) in the first quadrant, (-, +) in the second quadrant, (-, -) in the third quadrant and (+, -) in the fourth quadrant.