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Angles Formed by Transversals

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Transversal - definition

A transversal is a line that passes through two lines lying in the same plane at two distinct points.
The two given lines may be parallel or non-parallel.

Corresponding angles - definition

When two parallel or non-parallel lines in a plane are cut by a transversal, some angles are formed as shown in the figure.
The following are the pairs of corresponding angles:
1) and
2) and
3) and
4) and

Alternate angles - definition

When two parallel or non-parallel lines in a plane are cut by a transversal, some angles are formed as shown in the figure.
The following are the pairs of alternate angles:
1) and
2) and

Interior Angles - definition

When two parallel or non-parallel lines in a plane are cut by a transversal, some angles are formed as shown in the figure.
The following are the pairs of interior angles formed:
1) and
2) and