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NCERT solutions Mathematics Class 9 chapter 3 Coordinate Geometry

Chapters

NCERT Mathematics Class 9

Mathematics Textbook for Class 9

Chapter 3 - Coordinate Geometry

Page 53

How will you describe the position of a table lamp on your study table to another person?

Q 1 | Page 53

(Street Plan) : A city has two main roads which cross each other at the centre of the city. These two roads are along the North-South direction and East-West direction.

All the other streets of the city run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1cm = 200 m, draw a model of the city on your notebook. Represent the roads/streets by single lines.

There are many cross- streets in your model. A particular cross-street is made by two streets, one running in the North - South direction and another in the East - West direction. Each cross street is referred to in the following manner : If the 2nd street running in the North - South direction and 5th in the East - West direction meet at some crossing, then we will call this cross-street (2, 5). Using this convention, find:-

(i) how many cross - streets can be referred to as (4, 3).

(ii) how many cross - streets can be referred to as (3, 4).

Q 2 | Page 53

Page 60

Write the answer of each of the following questions:-

(i) What is the name of horizontal and the vertical lines drawn to determine the position of any point in the Cartesian plane?

(ii) What is the name of each part of the plane formed by these two lines?

(iii) Write the name of the point where these two lines intersect.

Q 1 | Page 60

See the given figure, and write the following:-

(i) The coordinates of B.

(ii) The coordinates of C.

(iii) The point identified by the coordinates (–3, –5).

(iv) The point identified by the coordinates (2, – 4).

(v) The abscissa of the point D.

(vi) The ordinate of the point H.

(vii) The coordinates of the point L.

(viii) The coordinates of the point M.

Q 2 | Page 60

Page 65

In which quadrant or on which axis do each of the points (– 2, 4), (3, – 1), (– 1, 0), (1, 2) and (– 3, – 5) lie? Verify your answer by locating them on the Cartesian plane.

Q 1 | Page 65

Plot the points (x, y) given in the following table on the plane, choosing suitable units of distance on the axes.

x -2 -1 0 1 3
y 8 7 -1.25 3 -1
Q 2 | Page 65

NCERT Mathematics Class 9

Mathematics Textbook for Class 9
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