Coordinate geometry describes the position of points on a plane using an ordered pair of numbers in a Cartesian coordinate system. French mathematician René Descartes developed this system in the 1600s. The system uses two perpendicular axes, the x-axis and y-axis, that intersect at the origin point (0,0). Values to the right of the origin on the x-axis and above the origin on the y-axis are positive, while values to the left and below are negative. Together the axes divide the plane into four quadrants. The document provides examples of finding the abscissa (x-coordinate) and ordinate (y-coordinate) of points, as well as answering questions to test understanding of coordinate geometry concepts.

1. COORDINATE
GEOMETRY
Class 9
Prepared by:
SHARDA CHAUHAN
TGT MATHEMATICS

2. What is Coordinate Geometry?
A system of
geometry where the
position of points on
the plane is described
using an ordered pair
of numbers.

3. French Mathematician René Descartes
(1596 - 1650).

4. It has two scales -
one running across
the plane called the
"x axis" and another
a right angles t it
called the “y axis”.
The point where the
axes cross is called the
“Origin” and is where
both x and y are zero.

5. On the x-axis, values
to the right are
positive and those to
the left are negative.
On the y-axis,
values above the
origin are positive
and those below
are negative.

6. X- axis
Y- axis
X- axis
Y- axis
St Quadrant
nd Quadrant
rd Quadrant th Quadrant

7. X- axis
X- axis O
Y- axis
Y- axis
(-3,-2) The abscissa is the x-coordinate of a
point on the coordinate plane.
The distance along the horizontal
axis.

8. X- axis
X- axis O
Y- axis
Y- axis
(-3,-2)
The y-coordinate of a point on
the coordinate plane : its distance
from the x-axis measured parallel
to the y-axis.

9. Q:1 How many Quadrants are
there?
3 Quadrants
7 Quadrants
6 Quadrants
1.
2.
3.
4.
4 Quadrants

10. X- axis O
Y- axis
Y- axis
1. On Y- axis
2. In the IVth quadrant
X. axis
3. In the IInd quadrant
4. On X- axis

11. 1. X- axis
2. Y- axis
3. Il nd quadrant
4. III rd quadrant

12. X- axis
X- axis O
Y- axis
Y- axis
(-3,-2)
Q: 4 Find the Ordinate in (-3, -2)
1. -3 is ordinate
2. -2 is ordinate
3. (-3, -2) is ordinate
4. Non of the above

13. X- axis
X- axis O
Y- axis
(-3,-2)
Y- axis
Q: 5 Find the Abscissa in (-3, -2)
1 . (-3, -2) is Abscissa
2. Abscissa is 4th quadrant
3. -2 is Abscissa
4. -3 is Abscissa

15. Any Questions?
ASK!