NCERT Solutions For Class 9 Math Chapter – 3 Exercise – 3.1
NCERT Solutions For Class 9 Math Chapter – 3 Coordinate Geometry helps students in learning basic concepts of probability which is include in the second term’s CBSE syllabus 2021-2022 NCERT Solutions For Class 9 Maths provide answers to all the questions in exercise present at the end of the chapter These solutions are prepared by our mathematics experts who are highy experienced in the field of education.
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Q1. How will you describe the position of table lamp on your study table to another person ?
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 edges of the tables as the axes OX and OY.
Measure the perpendicular distance ‘a’ cm of P (lamp) from OY. Measure the perpendicular distance ‘b’ cm of P (lamp) from OX.
Thus , the position of the table lamp is described by the ordered pair (a,b)
Q2. A city has two main roads which cross each other at the center 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. These 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 – streets 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 Using this convention find:
- How many cross – streets can be referred to as (4,3).
- How many cross – streets can be referred to as (3,4)
- A unique cross – street as shown by the point A(4,3).
- A unique cross street as shown by the point B(3,4).
The two cross – streets are uniquely found because of the two reference lines we have used for locating them.