Coordinate Geometry (Exercise 3.1)

Coordinate Geometry


Chapter 3


Exercise 3.1


EX 3.1 QUESTION 1.


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


EX 3.1 QUESTION 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 other streets of the city-run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1 cm = 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).
Solution:

(I) Only one street can be referred to as (4,3).

(ii) Only one street can be referred to as (3,4).