Our book, “The Fascinating World of Graph Theory ... where all lines between them are colored the same. For example, the lines A–B, B–C, C–D, D–E, E–A may be red, with the others blue. From what we ...

We often use graphs to present data in a clear and ... and the number of electric cars in different cities in the UK. Graphs help us understand data and reach conclusions. Line graphs are used ...