Learn Exercise 3.1 with Free Lessons & Tips

(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 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).