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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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