Whenever we need to represent something that is very big, we always need to use a scale.

A scale is a special rule that tells us what size in the thing we are representing is represented by what size in our diagram.

For instance, a scale of 1cm : 2km means that ever 2km in real life is represented by 1cm in a scale. It is easy to use, because once we know the distance in km in real life, we can just divide that number by 2 and then use that number of cm in a diagram.

Examples

Exercise

Let’s complete exercise 3E of pages 49 to 50 of the textbook (We don’t copy the first 4 questions here as you need to use the book for those to measure the distances. Below are the remaining questions 5-10):

Below are the answers: