The document Ex 3.1 NCERT Solutions - Coordinate Geometry Class 9 Notes | EduRev is a part of the Class 9 Course Mathematics (Maths) Class 9.

All you need of Class 9 at this link: Class 9

**Question 1. How will you describe the position of a table lamp on your study table to another person?****Solution: **To describe the position of a table lamp placed on the table, let us consider the table lamp as P and the table as a plane.

Now choose two perpendicular edge of the table as the axes OX and OY. Measure the perpendicular distance â€˜aâ€™ cm of the lamp from OY. Measure the perpendicular distance â€˜bâ€™ cm of P (lamp) from OX.

**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 road/ street by single line.****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 is 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) A unique cross street as shown by the point A(4, 3).

(ii) A unique cross street as shown by the point B(3, 4).

Offer running on EduRev: __Apply code STAYHOME200__ to get INR 200 off on our premium plan EduRev Infinity!