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NCERT SOLUTIONS CLASS 9 MATHEMATICS

Exercise 3.1

Q.1. How will you describe the position of a table lamp on your study table to another person?

Q.2. (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:

  1. How many cross-streets can be referred to as (4,3).

  2. How many cross-streets can be referred to as (3,4)