Page 38 - Mathematics Class - IX

Y
OBSERVATIONS

In Fig. (c).
F
C
Coordinates of points A, B, C, D, .................. B D G
A O E H
X´ X
are ........, ........, ........, ........, ........, ........, ........ N K I
M L
Hidden picture is of ______________. J

Y´
Fig. (c)
INFERENCE

By joining the points as per given instructions, a ‘hidden’ picture of an ‘aeroplane’ is formed.

EXTENDED TASK

1. Prepare a road map for your classroom.
2. Prepare a seating plan for your classroom.

APPLICATION

This activity is helpful in understanding the plotting of points in a Cartesian plane which is useful in preparing
the road maps, seating plan in the classroom, etc.

Viva-Voce

1. What is the use of Cartesian system?
Ans. Cartesian system is very useful to know the position of an object in a plane. In this system, the plane is
divided into four quadrants by two lines (i.e., X- and Y-axis).
2. Who introduced the concept of Cartesian System?

Ans. Rene Descartes
3. How many quadrants are there in a Cartesian plane?
Ans. Four

4. What will be the graph of equation ax + by = c?
Ans. A line
5. Give an example of a point which lies on negative Y-axis.
Ans. (0, – 6), (0, –3), etc.
6. Find the mirror image of point (5, 8) w.r.t. line Y = x.

Ans. (8, 5)
7. What is ordinate of every point on the X-axis?
Ans. 0

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