Interior Angles
When two parallel lines are intersected by a transversal, two groups of four angles of equal measurement are created. The four smaller angles have equal measurements just as the four larger angles.
An example of a transversal line, t, intersecting two parallel lines a and b is depicted below:
In the above
figure,θ represents the smaller angle while β
represents the larger angle. The four angles residing between the two
parallel lines are referred to as interior angles (reference figure
below):
In the figure presented above, the two
angles represented by θ are referred to as alternate interior
angles. Similarly, the two angles depicted by β
represent alternate interior angles.
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