Constructions

Look at the following figures.

**What do you notice?** **Is there something common in the given figures?**

We can see that some lines have been shown in these figures such as the opposite edges of a book, the opposite edges of a table, the rungs on a ladder, the crossbars of a window, etc.

**What is special about these lines?**

These lines are parallel to each other and are called parallel lines.

When are two lines called parallel lines?

Parallel lines can be defined as follows:

“Two lines are called parallel lines if they do not interse... |

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