In addition to these basic angles, there are some special types of angles formed when a transversal intersects two parallel lines.
The line XY forms 8 angles, and they are corresponding angles, alternate angles, and co-interior angles.
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| Corresponding angles
They are on the same side of the transversal, and in the same position on both the parallel lines. They are equal in size, and form a ‘F’ shape on the parallel lines.
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| Alternate angles
These angles are on opposite sides of the transversal, and lie in between the parallel lines. They are equal in size and form a ‘Z’ shape.
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| Co-interior angles
They are on the same side of the transversal, and between the parallel lines. These angles will add up to 180° and form a ‘C’ shape.
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