Consecutive interior angles are pairs of angles formed when a transversal line crosses two parallel lines, either parallel or non-parallel. They form a figure similar to the letter U, with the inner angles being the consecutive interior angles. The Consecutive Interior Angle Theorem states that when two lines are crossed by a transversal, the pairs of angles on one side of the transversal but inside the two lines are called consecutive interior angles.
The alpha (orange) and beta (yellow) angles are consecutive because they share the vertex and a side. The red side is shared by the other two sides. Consecutive interior angles, also known as co-interior angles, lie on one side of the transversal but inside the two lines. These angles are formed within the inner region of the transversal and are related to parallel lines.
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