Co-interior Angles Flashcards

Angles that lie on the same side of a transversal and inside two parallel lines.

Co-interior angles are supplementary, meaning they add up to 180°.

A line that crosses two or more other lines.

Co-interior angles only add up to 180° when the lines are parallel.

Two angles that add up to 180°.

Look for two angles on the same side of the transversal and inside the parallel lines.

In a diagram, co-interior angles form a 'C' or 'U' shape.

If two angles are co-interior, their sum can be written as: angle 1 + angle 2 = 180°.

If the lines are not parallel, co-interior angles do not necessarily add up to 180°.

Co-interior angles can be seen in parallel railway tracks crossed by a bridge (transversal).