## 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 2 ^{nd} street running in the North-South direction and 5^{th} 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).