CBSE Class 9 Maths - Coordinate Geometry - Concept Points (#class9Maths)(#eduvictors)

Coordinate Geometry - Concept PointsClass 9 Maths

1. The system used for describing the position of a point in a plane is called Cartesian system.

2. To locate the position of a point in a plane, we require two perpendicular lines.

3. The plane is called the Cartesian or coordinate plane and the lines are called the coordinate axes.

4. The horizontal line is called the x-axis and the vertical line is called the y-axis.

5. The coordinate axes divide the plane into four parts called quadrants.

Abscissa	Ordinate	Quadrant
+	+	I
-	+	II
-	-	III
+	-	IV

6. The point of intersection of axes is called the origin.

7. The distance of a point from y-axis is called x-coordinate or abscissa, and the distance of the point from x-axis is called y-coordinate or ordinate.


8. If the abscissa of a point is x and ordinate is y, then (x,y) are called the coordinates of a point.
x is known as independent variable while y is called dependent variable as f(x) = 2x+3 = y.


9. The coordinates of a point on the x-axis are of the form (x,0) and that of a point on the y-axis are (0,y).


10. The coordinates of the origin are (0,0).


☛See also:
Co-ordinate Geometry (Q & A -1)
Coordinate Geometry (Q & A -2)